Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0cd2225dbb5257…

MALICIOUS

PDF

82.7 KB Created: 2021-09-14 15:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d12f37496b1af62e4c63e61ca537803 SHA-1: b319809784f04c9285d3b4be738952d310cba7e3 SHA-256: aa0cd2225dbb5257c94c76917771c4d31037e311727fbbd9905a81014e04fbeb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=dls+file+2019 PDF link annotation
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/lezomodut.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/bizekulikunepano.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd5c2aac67---fitodikar.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/butaninopibadexijonote.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/xumoritepebadinopetor.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/61637501543.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/5182655687.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/toladorikamurepiwizaxula.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613252c359bb7---befusevatajivo.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/xazinibokuwamodapamafon.pdfIn PDF document text
    • https://arendic.cl/files/kuman.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/25459886942.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/gru2k8m9ae1mqi8b801dnh67q2/bejulopisibolud.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/66384775162.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/bupubamuke.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/76573209848.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/ribebobadepukozuveso.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/kazasaxedotidinit.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/81878945988.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210904022037.pdfIn PDF document text
    • http://zamgph.com/uploads/file/090328236951.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/99442315056.pdfIn PDF document text
    • http://esistore.com/userfiles/file/20075698167.pdfIn PDF document text
    • http://na3.it/misc/file/21324995168.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_off0000e13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13F 17380 bytes
SHA-256: b9951df35ebf5051bcbbc944bfba2cca2daa88b91e6c6c628e541ef183f32ef2
font_01_sfnt_off00010e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E82 10088 bytes
SHA-256: edb2a99364c77cbe82a35a5d756f5ce635f27dfa9aca6e2ad7f843582e6a4de5
font_02_sfnt_off00012534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12534 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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