Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e3dabc69497203…

MALICIOUS

PDF

89.1 KB Created: 2021-09-01 23:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8487ac2a1316f350483964059342d31b SHA-1: 9d9990f3f56ddd9909269332fc3ff36e68200484 SHA-256: 11e3dabc69497203d1f49e043f79ec04ec2ed898c713b7f3203416d3025ddbe8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to various domains, many of which are associated with compromised CMS uploads or appear to be on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm heuristic and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://almar-bus.pl/userfiles/file/rikanuvef.pdf In PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/ug4bu941nb3a2ug3eeq7v6iaq1/29095089248.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607247a0e2422---ponegisolagurirojonov.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/tuvajeza.pdfIn PDF document text
    • https://curvy.tw/upload/files/fibomozoxagoxe.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/94cbf599105d953f3cd5fd7f976adaaf/54768422897.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/tilezevik.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/vuwabagisirevegokeb.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210815_034901.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/75249114422.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/adcec19cc2e020e7a213a7181b15d536/33898169355.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/23469554674.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810fb4d5eba---fuvokipedosetifibak.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/52532773626.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/gidivudexavepozedudi.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/c90d714a1779ac6070efcd595c655452/59311108206.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/7cbe706d01dc3742c2b5155527443120/pilovojadupixapa.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/fezokejipigev.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/1580452857c3efb7aaf03eccc4cdb4af/palojoselimowepujivarax.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/kexulokevad.pdfIn PDF document text
    • http://hodori247.com/uploads/files/dojepi.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/86811231383.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/7i71i9uknnh5e9uopksmmrhcbp/bipazalenubenotumivoso.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210531_172043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ferrets+up+for+adoptionPDF 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_off0000f7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11003 10520 bytes
SHA-256: 5779410345185554242bb020bd6d1a5c40dded12a3f771df36c11184e4b74bb6
font_02_sfnt_off0001280c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280C 18032 bytes
SHA-256: 7fc1a4fb3302607a786695f3eb7c7fb0f4fc400f789d2a3ab46092d310129e08

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