Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3afbf23717b68a…

MALICIOUS

PDF

85.1 KB Created: 2021-09-04 03:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4b76baf8cfb07f5ac90b62dddc126cd2 SHA-1: dee4cbe850acef8b076869ccf1631edbafdd1d92 SHA-256: 4a3afbf23717b68a075b039a5f17696d5c13ecdbeaff911a7f9a2e12967438f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://chcial.ru/uplcv?utm_term=panela+de+pressao+eletrica+walita+manual PDF link annotation
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd8b109dab---wakabinugedodafisageb.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/pekazixixelaninaxelim.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/efp6jhp1la7vpcbm6baf0to0e8/xekalagekopesifojogof.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160afc1dae0159---75231490921.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/657d83049422097d0397af4ab011d61a/fapagefigariva.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/gujal.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b2530daba82---47894687668.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/e18p7h6q8il25as6662uqnd9pm/getisipevovotavela.pdfIn PDF document text
    • http://missinternationalbeauty.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/65740953995.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a94d24b4a---lexusonudixiv.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/mukilujojo.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/notolegipekibobifadi.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/9751855215.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f07c251a4---97302688540.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f71165d124d---tuwatomixorutupo.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/tilifuvu.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161185c96a5e72---29589510436.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/61594741777.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/c3b312818f066f44f93fe1e356929024/67266288505.pdfIn PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/fonumomitelejetuniwiwi.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/34110388150.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021060807191270554.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/74326905207.pdfIn PDF document text
    • http://dejede.com/userfiles/file/53505303297.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE394 19148 bytes
SHA-256: 19ebd860e53b1459068d5f043793dfc3e7c508a27d2ef69349d440a6c19d303e
font_01_sfnt_off00011534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11534 10864 bytes
SHA-256: 92517b63f309852d43788037baba30fe4138dc66b2a8cea3241b546ff6edfe56
font_02_sfnt_off00012e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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