Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd1e7ba5a47120cb…

MALICIOUS

PDF

93.9 KB Created: 2021-09-15 12:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6df4337306b2771dec6fca372cff2f53 SHA-1: ff3a01071194616e508b730f2e5355d1be5b8ea7 SHA-256: fd1e7ba5a47120cbbad631e4f86c996db3e7ab56e7c4261373dc1b280b5a3186
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 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://aicpwdosaeast.com/ckfinder/userfiles/files/rezemimirezulu.pdf In PDF document text
    • https://leciv.fr/uploads/FCK_files/file/bixijuko.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/redoduvujaguzozagodogigo.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/vomijonokizimilulekudi.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/35873104022.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383ffa8cb58---24117489746.pdfIn PDF document text
    • http://eternaseguros.net/files/files/41576207078.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/81092394c2d064048e53f5956dc6188f/88957566397.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/47235683245.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1630536776.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/24164339354.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/10157920927.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/27488757473.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/8he4ap3iq43sq9qgr5scgp8lsv/raregunanagam.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/lanakitemozabopomo.pdfIn PDF document text
    • http://drtamerturan.com/file/17985099780.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161415fc3910c7---begixemolegexaso.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/be10459d107be5f4ce0822e1a2434f2a/fufogedup.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/lafawefila.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/zowebevinadig.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/sajisibinure.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/75363279326.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/naweba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ganti+bahasa+di+hpPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DE 19592 bytes
SHA-256: 50c8818a78c925abe9269418d682697615115f75049e47da016458ba0c9189f0
font_02_sfnt_off0001170a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170A 10272 bytes
SHA-256: a56b78a7689f4ce5b62b116e252d3f1cda6acf34267be51fafc8393e232140e2
font_03_sfnt_off00012dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD3 21832 bytes
SHA-256: 78067c2b106550351167ad4212ace6780b2abe168d4c0362a46e4405a62d519f

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