Malicious PDF — malware analysis report

Static analysis result for SHA-256 07fa9b838b51fd0b…

MALICIOUS

PDF

87.7 KB Created: 2021-09-13 23:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f8e4f5f769b6861fa43f4c06058a1316 SHA-1: f39e55ab0a3a3410fb6c1f91a22be3bec06974e3 SHA-256: 07fa9b838b51fd0b10c2399287f294fafa620166bc40a7b570f4d7074edeaab3
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicate a link farm designed to redirect users to potentially malicious content. The primary attack pattern involves luring users through these links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://tootingtaxi.com/survey/userfiles/files/95454688097.pdf In PDF document text
    • http://studiosantese.eu/userfiles/files/vokaxozugikomum.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7645b1152---sanogelumu.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/mubetapegenuzig.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/zupigorevex.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/44215817030.pdfIn PDF document text
    • http://ombs.ru/uploads/files/talulupijagupixegugadoli.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161390a524531e---tusakawu.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613855d6d122f---zufavugejowotizam.pdfIn PDF document text
    • https://yellowstonewildlife.com/welavadulagaxagupiborete.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/48901388940.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/nawulexotojozej.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/bofanupolevakifug.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2b2458513---87128546508.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/vavelezenipoguvamunufi.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/71197355836.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b6b6c87ba---biwororeb.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/xaberorevo.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/puzimojodenukazivib.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/65243240001.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/16164166579.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/80ac8d99018032e71632484e62fb6e17/letolesopusunoz.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/48384304116.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/59418180427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=dragon+ball+super+broly+dub+123moviesPDF 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_off0000ee59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001066b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066B 18468 bytes
SHA-256: c13ff86c6173a83f1fb7225bba9bd484454b4eb45337c1e6a22d34f126c75e1e
font_02_sfnt_off00013704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13704 11404 bytes
SHA-256: 162b9ff7eeb3cdb208577739529eae52475657d3819e7278a12500510add9d63