Malicious PDF — malware analysis report

Static analysis result for SHA-256 9448b45697ac61e7…

MALICIOUS

PDF

92.6 KB Created: 2021-07-01 16:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 66691f6df1fbbc6507635ec1d2c85cbd SHA-1: ccf50cd0b01f1d35203c8b19ae7731622858e7d3 SHA-256: 9448b45697ac61e7d3c8675ee21ec452f33c8b1cd1f8b9f2db657c1a6717f55e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext. While no scripts were explicitly extracted, the presence of multiple compromised CMS upload links and the ML classifier's high confidence score strongly suggest malicious intent, likely leading to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pistant.ru/uplcv?utm_term=how+to+do+video+screenshot+on+iphone PDF link annotation
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/743268593db14a0a873e9b6bb12d4ca8/10820607322.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b15bc77dbc---15154107682.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad54c33e2b---vigabokekupexadeg.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ian4qeidopbrp0qk6o8chr3307/1140536597.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160874bd8626d5---litakaburuzaduvevug.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/xikabosovozite.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/tmhucjh6omdgr4ltvjduhbkgvp/vofugamalafupojoku.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/8ffbaa0c90525c58303a86fcce1ab065/4697264306.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adaf1b8ea7---60991703858.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089f381633cc---33408335632.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/4df8c49f93fa895628598cbb2a7e4877/69882170378.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/9pratdrc6p3d9upsllofvs8li2/balawekabudepug.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/dawinikefepufitonijed.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fdf94ce1---36173254123.pdfIn PDF document text
    • http://thecreditcrisis.net/clients/73966/File/watakelikebugavebe.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/lagajaduriwumilijilavatuz.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/69092768619.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608772ce19406---morefojifinawiguvubuzixok.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/85500424344.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/7f41923934e349fec8b324ef347293c0/24199436430.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/fd2ead129a98039d728def52e422a707/10301407955.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/tiruxixeruveneniwusaw.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/79246132901.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608d369c233ab---63580474533.pdfIn PDF document text
    • http://unseretochter.ch/images/file/96157047076.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED51 10548 bytes
SHA-256: da1b5d9b7b39440faed3e932a6294168c95aeb857fe1b9bd940e744fb722d6f1
font_01_sfnt_off00010546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10546 17264 bytes
SHA-256: 220ca0bcd2c80ad142d5eb92fe73b7a1f72e222fdada06acd6766c1c2777f630
font_02_sfnt_off00013242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13242 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A53 17532 bytes
SHA-256: 1588a5c0cdbbaaab73489238d2c80399ddd7e5fb1787eebbf7a8f837425138c9

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