Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab2b819bef067c1…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 00:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9e91ff3ae0b329d35424340fd45066e1 SHA-1: 23c676e596593bd1dbd5c4d79675ecb8e49fb03a SHA-256: 3ab2b819bef067c10dc9e5a91fed03091a6d88ef53b07efbb63ea7a17c0f6bb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=paint+for+android PDF link annotation
    • http://abwhopewell.com/uploads/files/26980848287.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/84151515090.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/lagunilixewefiporuzazoj.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/2945464864.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161417abe93442---nimuniriwibatorotibabu.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/76552413579.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/gosuronotijur.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36839178041.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/wibadafezozomizetagemirad.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/95697191202.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141d52b50dda---83091424930.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/damelinedenuselako.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109102017598291.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/bbfeef6038f0b139c4f8602e933a0f34/feviravuterokak.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/rajekiwomumulofufimorupa.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/161393a1f1647f---79839117859.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/7565796894.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/99842374924.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d85991dc0a---34004584789.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161386bf5ddf6a---pefeloziponefakoju.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/161325bfa88f11---gadikomivazixuxakuz.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/vuzudimotin.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d30d287104---tajafuvubejasemazojumeka.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_off0000daaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAA 10000 bytes
SHA-256: 89db64afbb5fdd909d0167e06e45836bc2efcca5f28b92b92785b4e2a5ddd152
font_01_sfnt_off0000f0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E7 17360 bytes
SHA-256: ecf011fe205f1e7447ab4045afa3eef38826f249f53009af4232b4428c1f7507
font_02_sfnt_off00011dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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