Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba312e407e557386…

MALICIOUS

PDF

97.3 KB Created: 2021-06-26 08:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d55c9be7cbed811453fd24cee8b1d372 SHA-1: 7c3428b4d4945233f5e1e31c5d5ca57437c97e25 SHA-256: ba312e407e55738636954799398f2d36060906761f435aa7c28a80b0afbd5c22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing lure, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077d29be4a87---kofinolifebiwoxig.pdf In PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/vudonupijenenet.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c2cac5576---14048451838.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607de017b99b0---fewodejajovegixebade.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/6a21ac20b6a0d0d069736fc27ec4362b/somexatulikupe.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/75c2a5352f9a4f6fa33720af36a16a1f/96202078837.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/0qmae25s3kl92eedjl9tjg6eo7/kunonibugarajipa.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/0d0a05d20a8ff1507c8c7fa61d62cfd1/36257631882.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc231b3c520---15894319283.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-13/20210613025423791864.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/69929627311.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/banegato.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/6e0a7a2b00afad70f25fffd3ac3a535b/57686482223.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/dodidaxozeg.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/b6cae5e2f022108a9f9c114aa55c4def/vedegewune.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/337f165101283a052b0129608cac707b/77805872023.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/xudedagexerom.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6b544053a---24491818718.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/62375124408.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/2677449674.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb4e768851---zenamop.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/866cc94ac45eda3acbca8473824a2585/60889988138.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/58539119018.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/godijunorisukogawufu.pdfIn PDF document text
    • http://funperm.ru/content/file/nuwuxemekos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=fifty+shades+freed+completePDF 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
stream_002_off00011699.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11699 18444 bytes
SHA-256: 06d5aa26b8f0ad807127894269caab61d62d806d581dfe8627617f443bfd0cf2
font_01_sfnt_off000146a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A2 10872 bytes
SHA-256: 03038483e210513df268758f283f2d23a406e6876d351cb1417702b3657429d0
font_02_sfnt_off00015fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1