Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3457744de4e4cf3…

MALICIOUS

PDF

88.0 KB Created: 2021-09-05 10:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 752f37cd227e6d1c1477ee2c1211b90c SHA-1: 2fde03e4dd9efdb3bed1318423dae1b89032b1ba SHA-256: d3457744de4e4cf3f94320256bf702df8831456bd13fd0bc309f709448a143b9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it is a link farm and a callback phishing lure. The document body is heavily obfuscated, but the presence of numerous URLs pointing to potentially compromised websites suggests an attempt to redirect users to malicious content or phishing pages. No scripts were extracted from this sample, limiting the ability to determine specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://aimic.com/userfiles/file/61167686078.pdf In PDF document text
    • http://raykingcarroll66.com/clients/2/29/292092747e06e0ab09130fa737b110c0/File/11857539730.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/kodasubebijinepunapoker.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/11914131344.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/setodowapofa.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/cfdb967faf001aa42bb960f1d949d0d8/25487518961.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/5e98aa0b93b04a54fe0eae1def47502f/tafixinanijabof.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/taxudulivilexelokidawi.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/804a01c0220e2a88efebeeea406243b6/basimesimivoti.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607533a3be56c---fulavavigutiraxaruk.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed4a16f7f4---70887256199.pdfIn PDF document text
    • https://digiconelectronics.com/media/45682116727.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/sinetutoduwuratuguxobuli.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/pijadajuxodonuxad.pdfIn PDF document text
    • http://hopkinshigh1966.com/clients/1/10/1054c114374c88b4a165e91103565d41/File/xudipekosadab.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/pajojidenijonumoxis.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/58768055734.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/77655e8bf70f8aec43213beaf000ca17/rafudurelezopanaxetesitap.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/43561693499.pdfIn PDF document text
    • http://www.pvvc.cz/files/46032248344.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/84qm3bj8iv2cohlv1vokkjng89/22175635412.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/11154989725.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c6310138360---mivilodazenudafonafokaxet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=cd+action+01%2F2019+pdfPDF link annotation
    • 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_off0000f100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF100 18648 bytes
SHA-256: 6b5fa2756f001bb044a34af8700482df0bb042c9fe815269a5f28e84eb6deb5a
font_01_sfnt_off000121e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E7 10692 bytes
SHA-256: f990da37f4f490e680e79d39e83d24d9d2adc0a2e5e375f363b3b8b049331e4d
font_02_sfnt_off00013ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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