Malicious PDF — malware analysis report

Static analysis result for SHA-256 d235b33fb53265eb…

MALICIOUS

PDF

95.6 KB Created: 2021-09-07 06:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7e803284165ef02732da6ddbbe98219c SHA-1: 887f5c6bf4b6f8a4345dc077bcf9212afec329f4 SHA-256: d235b33fb53265eb1ac747c6becdb6972b4d9285b9ddfec5c2f330defb0e851e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to trick users into downloading further malicious content. The presence of embedded URLs and the overall structure indicate a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • 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://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/922417ad9f36de4276c83e400518c715/wofimadubetiwil.pdf In PDF document text
    • http://progfin.pl/userfiles/file/65797069567.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/17856620139.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160855e8e378e3---47974395451.pdfIn PDF document text
    • http://twilaw.com/files/files/damazujopipumedarafumi.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c01515c22---34120739403.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078134909561---zurubaropebesekinogunu.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/h7tm8vhkk5k268b1hcs8mt3cf9/1735918826.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/3e22rqtprr4q5r3l37r8v26bdq/99738975638.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb58389ef80---torizuj.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/xulejetogopomudosixeliman.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/4344021289.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/70c7429f1c58a109a72fbe0180a655d5/85237122850.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/88646267320.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/9624af92f269d2d77a524b92203d338a/78017538522.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/5d9964977a87ced07be2f726000f0395/93312958330.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/porivinuwetiwaropep.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/27997921730.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/2e9362d14587fb0d41556a9479f33780/kadurusumiw.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/pamemepedediweji.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e1a812e90---ripokuzuluduvomavilolo.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/vgmb5upq5tllspfek7n864khap/lizifopadixadabati.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/93138983320.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/3l2o1cu4v5v7e7tihb0nerhkss/88460518459.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/55985107319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ltv+1150+service+manualPDF 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_off00010f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F40 18764 bytes
SHA-256: 165f64b37b864725b7505dd474c20c347c3c4c784997b60c02283ca35a2fbd47
font_01_sfnt_off00014005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14005 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001581c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1581C 10704 bytes
SHA-256: 3aa4c33bb31cbdea2279ed258275c44b919a7e700271ee33edd24985584ed8db

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