Malicious PDF — malware analysis report

Static analysis result for SHA-256 0705913b6edefb9c…

MALICIOUS

PDF

85.5 KB Created: 2021-06-27 19:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ea58047545b1581a52f57c123fc91a4 SHA-1: 04e2cdffddb1065a6a7998551d4ead517225b0d9 SHA-256: 0705913b6edefb9cc227ffc33bd6d38fc0666fb73eaa6757f91b13ef69424806
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. Heuristic analysis revealed that the document functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links likely serve to distribute further malware or engage in SEO manipulation. No scripts were extracted from this sample, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160d63598e816f---39067229260.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/624e23963a9e04f335023c06aae224d0/rojopiwin.pdf
    • https://crownprolaw.cn/userfiles/Proj_Name//files/kapoxisimizar.pdf
    • http://bartuceviri.com/userfiles/file/xididimopiwajomimera.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/e386423579b1a18928cca4287d40b8a1/rofufukuvovubizem.pdf
    • http://gagutp.com/sa_upload/userfiles/file/20210513204546.pdf
    • http://fitviewer.biz/files/file/85410539574.pdf
    • https://cristalparkhotel.com/ckfinder/userfiles/files/xiloxagudofog.pdf
    • http://polskienarty.pl/data/aktualnosci_imgs/file/zeduvakur.pdf
    • https://bednidhitraders.com/userfiles/file/48949360515.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ba65b527a---59367162722.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16080f5a27b414---zuverawofojaxat.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f0fedd3fd---mekokesosimarosakuka.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/1ecgkvt20tj8nmv71tl2j3p2o5/rosozapokifepug.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/6689862f1f411c6b75431a26f97de7b3/wigakosubevobuziza.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/0olos398s5iaq2q43rkojmvr4q/defopuzapageribu.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084a548806be---garatit.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb1fe63d56---35187093639.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a0b79e92cf9308b65318a6a61b73a0a2/18386084129.pdf
    • http://www.parkwaytransplant.com/media_upload/upload/files/xipimamufaxeberujokigigo.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/93gro4nf1u280a81mu142simv5/kagijetegilitiritexinaz.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875c5621ab2---16961366228.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/80d7ec379f23deeac093c4c3fea5c951/lanewililamujineniwa.pdf
    • https://kme.pl/global/app/webroot/uploads/file/16231723159105.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=lighthouse+funeral+and+cremation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb43.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB43 16792 bytes
font_01_sfnt_off00010355.bin
c9bca137434ed74b771494273ecfa4d072604895e1c0fefb9bd4ada5a546730a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10355 16988 bytes
font_02_sfnt_off00012f59.bin
5ff6c97b3455e853d81f197840c5ca105c2ae918eb5c32a6091fabe727d992c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F59 10980 bytes