Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b8a050f492cba1…

MALICIOUS

PDF

99.5 KB Created: 2021-08-06 08:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ea06d789786f394264363c8d61045cb4 SHA-1: 4ea469b1b70b75bb150e28d8aa72e7850e4d58fc SHA-256: 57b8a050f492cba1dbd41a2d797549cc4cd2279d9438b5a38147f0d9042cde6a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. While no scripts were directly extracted, the presence of numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggests an attempt to host malicious content or redirect users. The ML classifier and ClamAV detection further support its malicious nature, likely exploiting a PDF vulnerability to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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://ticaproduce.com/ckfinder/userfiles/files/xasebemogifezam.pdf In PDF document text
    • https://study4student.com/cache/fck_files/file/1561420267.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e89ba94e661---40241503540.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210728132920.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/33721733.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160994fc3ca9aa---6522603288.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/i0siqpoejjnqlsqe4a0f56i73p/raxebupu.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4bb699ff0---sikutowewadufewererugod.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f067880b357---duwogaras.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a03e428f5b---48021905928.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a00efbbcfc1---tuxokititevojugawesewur.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d40df460178be855809a12e49cdfca55/34566517661.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/27389713898.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/65542348058.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/lerinavuwizarorokitidebug.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607916d1a1706---38773970374.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/396205aa5fcc1f8514dbfbe504c22527/nexovogidafapofujo.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/6885318746.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/38621606716.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/mepuravunidigegosoxoziti.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/3945392996.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081c5c4e2d81---nugibafikegex.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c694f88c622---foboxoxu.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210628234949_3sjmzo.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/82351842437.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608124d23eebc---95465382130.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/naraxetulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=adobe+acrobat+9+pro+split+pdf+into+multiple+filesPDF 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_off00011e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3B 18068 bytes
SHA-256: e2221fa1e8c381f8a50ae763015e839a7242a5377adac9e9208ee059fd307399
font_01_sfnt_off00014dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16614 11172 bytes
SHA-256: d3c06e5e76b4f39085528783e6eca492c97dcd31303ef33fc11c240d7e508251

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