Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4afe9eda43cadc4…

MALICIOUS

PDF

94.6 KB Created: 2021-06-26 01:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb798d2bd6dc3647a105deb6207fb03a SHA-1: cd7c10fea085bbe2b7ed3031b4efcf69bca72f73 SHA-256: b4afe9eda43cadc41df5fe511388fcbe01da94c8eb6ae11e6c3cdd813b2fdcfb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites and other domains, likely serving as lures for users to download content or visit malicious sites. No scripts were extracted, but the structure suggests it's designed to redirect users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://laborke.ru/uplcv?utm_term=me+before+you+full+movie+dual+audio+download
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609867f0bfc9d---36445548349.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/6ec53fb162a2fffb26563cd69ef7d3d4/mefopi.pdf
    • https://nhadatonline24h.com/Images_upload/files/52947607579.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/4d02ab6d4ea3a2433e54f673a6c35818/58524443691.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadd7185a61---pajoladomuda.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/ca345458ffd797923cc3686743a9fcb7/27240490933.pdf
    • https://bistakalikotenetwork.com/userfiles/file/25213978753.pdf
    • http://nhs1980alumni.com/clients/878257/File/73930305185.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/34027ab044b034a9441525e4d42c6794/zugojopurise.pdf
    • https://mumegram.com/userfiles/file/sagadakamos.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/aohknmgjum01fuqnrmb5vvaa6f/rerixilebinatir.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c73afca07bd---50579131055.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/c5807ddf88acdbe58680d3d4b2d795d0/dijuxapukexatep.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/4qc3g63qfojbn222tvmrsvd5k5/22039138410.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160851c0ae0a89---wewumoxovakafu.pdf
    • https://ddshower.com/ckfinder/userfiles/files/53849028528.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9c8dc74c5---kusisilexotagokawugeluw.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/ql7h1dvevu1ign521i8mp6dn52/26954992095.pdf
    • http://simonide.org/userfiles/file/43006846996.pdf
    • https://vicotelecom.vn/static/source/images/file/welodape.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094d1b2d26ee---26611724717.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/a8ba755f2025a2533893b7933d63fea1/xeraguva.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014efb.bin
e132f690695c2f6ab3d649e97b4e2152199a31c37b4598522e7570950109b918
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14EFB 18820 bytes
font_00_sfnt_off0000f1ed.bin
28e46b20a5adb0831d3edcb35243fa9d8d094afbc6605df49d6ee8bbfecfe9f8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 10748 bytes
font_01_sfnt_off00010aa8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA8 16792 bytes
font_02_sfnt_off000122ba.bin
2ebf2909627497013c987048500835cbb2629d298cb189de55ff739c1efdb623
pdf-font-stream PDF embedded font (sfnt) at offset 0x122BA 16956 bytes