Malicious PDF — malware analysis report

Static analysis result for SHA-256 987493921845eaa1…

MALICIOUS

PDF

75.2 KB Created: 2021-06-25 09:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 22d67c20d34e9bbbe2500ed45584e0f3 SHA-1: 46cf4be19c713bb5e9a61a3fd293f98dd668edc3 SHA-256: 987493921845eaa1a0f1aaf17ca617f7fdcd4b0678f04c06dd8e23918594c7b4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link T1059.007 JavaScript

This PDF document was detected as a phishing lure impersonating Amazon. It contains numerous links, many hosted on compromised WordPress sites, directing users to download further malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to steal credentials through a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=worksheet+on+interrogative+sentences.
  • 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.
  • 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://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b748bd8cad---9595567963.pdf In PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/70dbf4edffbd69d379cd9540eb311687/lififitemuwukizevarem.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d945583d2e---76467473468.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/711c2bd0459c2a5bed48b93b9c58e6b2/sojebagikubi.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b11e7559167---letixirosemobofiburu.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/bugoden.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852f08eafbd---10688120600.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/kejetadabufodipemeporituw.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4ce140659---38101140366.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/d78ff3c1cc9d1a32d42315bcb60d1b9c/gimisig.pdfIn PDF document text
    • https://goodline.by/userfiles/file/53043849785.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160975ba3cd7e5---bikabitofutunokupuxa.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16086cc5f5460e---mobobifonadukolajeje.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16079009c2d124---51268393552.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/44719233540.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/jufavaj.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/xuwumesazopazovegu.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160798ac560a2e---20977510627.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=worksheet+on+interrogative+sentencesPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE762 5168 bytes
SHA-256: 5a2782bded85692ba403a24394113690e0a414e90037225597ea68eb610eb29c
font_01_sfnt_off0000f909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF909 11396 bytes
SHA-256: 65abff7c150c6279c9da96ac21857bcbcd51035db63f5a34a7f96c4d5f90d9ad

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