Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa17ef3eba6563bb…

MALICIOUS

PDF

89.0 KB Created: 2021-09-02 21:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 75874cbc1f3862f94bb2d70a00535c01 SHA-1: 7b22c170afe9e26242a76b227bd0f850a48ea71a SHA-256: aa17ef3eba6563bbb1deef8f87935f34f3f3bc04aadfd024beb03e7608e8845a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=electric+current+and+its+effects+class+7+pdf PDF link annotation
    • http://yjsyrj.com/userfiles/file/87938132834.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/5d622eba047171abeeb8d13c13202fa0/26201676133.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/6181284761.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608228907c647---5520739135.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ast4ncrb5l97d4lhihlsi1j4l6/76380312996.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/b1e4aecbd710346f6cdd24f61da46d6e/34322666143.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42258858385.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/wugenabawer.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/49023728176.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/62666446340.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/22940718459.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/dc3da99e178b5ce4dbaf3b7d30bbd8e7/53718948895.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/nidimubakifobufugufugezes.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/17295851898.pdfIn PDF document text
    • http://aven.su/userfiles/file/mopibefegetilusogibema.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/77098654594.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/35452582107.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/donufiwazezazewufem.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/supabaramiwarixero.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9419580b9c9398876d763672eff2fa83/likanobepazoximateru.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081c70b3341c---84814127379.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/68202842265.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_off0000fa58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA58 10624 bytes
SHA-256: 1508eaad9264e4ad48c98e38a6fc1ec1301b1c9135ae9688995c18910c86a1dc
font_01_sfnt_off000112c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C3 16824 bytes
SHA-256: d2090b9d57a750fc8073838f7d94a7ee0e659196b624468307c511b0ca9c2c2b
font_02_sfnt_off00013e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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