Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f544aac7bef79ec…

MALICIOUS

PDF

83.5 KB Created: 2021-09-06 21:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6e6ab747515dd3697fad98b031e8a2b4 SHA-1: 002d0fbaae5a696e44b968b758189cb635210c6f SHA-256: 3f544aac7bef79ec2c284c13f5b014d77d542059a1389c507cc2e01db5c20f12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://smolensk-bakaleya.ru/userfiles/file/binegaramofata.pdf In PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/dibubujisepudejazokiru.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/20622610144.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/latefapokemedimimegativ.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/kigitagolagefenimomifof.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/najivusorewubekifukupo.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bafb08b7ee9---fakigafimubizozob.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117774e4e727---48246314045.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/5e5079ffe6ec89cefe7fed5b5747867d/41968253817.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/kovolibubazegi.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44bc558597---3467084828.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/069tr3vbdjs7f5ucupmrre9iq9/kegegawa.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1362e2055---90689050576.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ddf94c2b78663418dc508a6ebe4ea781/tanarosotogatuzilutagejuj.pdfIn PDF document text
    • http://armanetti.com/images/fidegujixegepulu.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/mu2pakhs55138lo0ak38n67u42/popanigapipig.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/a023fc846efa4c563a0247222caf71f9/8048590144.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/45234327920.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/jazawofanixudamiduxusos.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/pazem.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/bd8561ebe837a1b592d06b9e47df9762/nufetizasesupugivolu.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210810195517.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/aca8244b624cb2feb0740d1ff012dfc2/vexojijofi.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/9d0ba6e77b317f72bc6390273a2428b8/53694873354.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d28abe4082---voxufivovuranalonemok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=warehouse+operation+and+facility+design+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_off0000dfb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C9 17660 bytes
SHA-256: 03042dc9f62ff20f7c4f9912c22e28e31488e784c1e2e1e2cd342033356f3546
font_02_sfnt_off000125dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DD 11108 bytes
SHA-256: 54e36d1d11f969be1b43bf65a3ddf709a17216ab98ec50d424421ff3d3292446