Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81f7dc4630d0d9e…

MALICIOUS

PDF

79.4 KB Created: 2021-06-20 04:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0aec5fdac985a8c1522f1712482775ad SHA-1: c37a7fe8e11d9aad2893e3a79d65afe8db83e93f SHA-256: a81f7dc4630d0d9e3780f10020492db48dc6cf1d4e241675c33eade4805c22cb
256 Risk Score

Malware Insights

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

The file is a PDF document that contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent is to solicit sensitive recovery secrets or private keys from the user. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_RANDOM_URL_LINK heuristics suggests potential for malicious content delivery or redirection, likely involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://bataretak.com/img/files/file/13406926443.pdf In PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43eea15680---67546250830.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1fe312e00---2915579447.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5c42af3b8---kanukaganarujusiwuluxibo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609851f09f45c---92269816317.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/hfluum8en64v1on6n59i194490/19625418197.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/6a4b333388baf4472d6b9fcf9388ec2d/bemilajurarafexe.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/60866574865.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/temaranizalepujodukukapim.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160949bb911f74---visepifuvijejijoj.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/9028068124.pdfIn PDF document text
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/avtqdm5tgm1njlac6sjpklp8l1/nojapasunobofebuguwubifit.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/soselejigeve.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1623662361.pdfIn PDF document text
    • https://chptravel.ir/data/file/powodivemifepukozezoz.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/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=use+of+facetime+in+iphonePDF 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_off0000f722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 5116 bytes
SHA-256: 5e7a7f418b4886fa8fae0b19ef52f168f26c512a3c2f84e04a179c44258bc7c7
font_01_sfnt_off0001086f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086F 11964 bytes
SHA-256: 2daf7319591e08e602698c581dc19efd4bbc07a3c8cb8878a5a3fa3068d08f75

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