Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e5ac653dda848aa…

MALICIOUS

PDF

110.3 KB Created: 2021-08-12 02:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6caf3b47416dd9eb9928c7f5da9c9330 SHA-1: 21bd7c72f2c7aa938b68709beee8d5c2c72a3db8 SHA-256: 2e5ac653dda848aada25d3f61ab314e7a26731ecb3a6aeb65b1d781ab4fa8985
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to distribute further malicious content or phish users. The PDF structure itself does not contain executable scripts, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://queure.ru/uplcv?utm_term=what+is+1st+position+on+guitar PDF link annotation
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/o61rlpdi6da3bdi0lkg9u4kf1l/dodapipiv.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/lvf02b6pofca9vc7l2kk20r76q/8525532394.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/wofepofazajiledi.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c49488b0f---zadadipo.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e18eea9154---pedelaxoliniposan.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/88964093677.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086efdfc286e---barazoxexovitegat.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/iioqbsk6ut9nu1khlh8k9076s0/zaronevimaxeza.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/a262d0a802a34223f044f103ced781e0/96635095955.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084db4f4ca63---zebesibanezomovesujemezux.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/211410de462bfe381bc2de8cfb1ee932/lijisafazomejigurisekab.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/hump7kvr407ni7364alnaanus7/kexakab.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c17b9b9825---76451443410.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/5v9qbv94vrmpq1t4cr4s8uujge/45924031980.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/zinamaziziw.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e082a57a5---rasujeledun.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/kegoridaler.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/20725419834.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/50195445602.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/gp4qdv5p1hjs6bijr3ejgoldso/ludekofizinalawojugunotez.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a0cb591f1---jigumumulozonijorupejuv.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/eduigfm0u6tubrm9n2f919h5o5/46452292039.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/rifimoka.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/97903170201.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c477a68e2bf---sibudotodotef.pdfIn PDF document text
    • 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_off00014492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CA4 21068 bytes
SHA-256: 5b8d3b50cbe9050b6e8ad8c9f49332fed9463626be7ef07cff3f88b5a70ccd92
font_02_sfnt_off0001926d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1926D 10496 bytes
SHA-256: d3cb2bc89bbe7df3ced6c96d3e36ca9eb51e96bbf5ece80ba7314cdaa7ab3980

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