Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18fdf8291c030a6…

MALICIOUS

PDF

94.8 KB Created: 2021-09-07 23:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1d8c557b83b28cb0e9519e624f4cc082 SHA-1: 74424c237e2604a367262f56397dba1039e63612 SHA-256: f18fdf8291c030a695cdc94678d4783e6add945f4f96a695c5051554624cf233
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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 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://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d523c4f1b---pilositedodizo.pdf In PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/96b370dd4a1417feca2f462a66149df9/54962225281.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcc365fe12---bababatifafumaboxabux.pdfIn PDF document text
    • http://tano-cable.com/d/files/nujadixotomiwegodul.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090800001128.pdfIn PDF document text
    • https://socardan.com/userfiles/files/1983258331.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b134df7a4bd---dolagud.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610cb013b3bc3---takisikusajugogoxilipix.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/ratimexibed.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99ac60e59f---31480393268.pdfIn PDF document text
    • http://prestopc.it/upload/file/72220663819.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f1ef0f9f2---62162441806.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53302284475.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160937f667243c---jovemufefa.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/30959119118.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/mamoxizuvawifukune.pdfIn PDF document text
    • http://mitrasuksesku.com/userfiles/file/34081470956.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/tinav.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/a3a72d22df7866da5601f954690409b4/7996255220.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/vixemipovabigito.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/19798848449.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/juvuxo.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/xetixa.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/57007584993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=complications+of+cesarean+section+pdfPDF 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_off00010fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBB 17540 bytes
SHA-256: 26d1b496fc866097d985ffef60f19bcf1b3b192eb31d25154d704698926c52bc
font_01_sfnt_off00013c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15435 10812 bytes
SHA-256: 5706a03a208c3eab544140223dd024d337ac916723cd35f946e17da0faae7494