Malicious PDF — malware analysis report

Static analysis result for SHA-256 315a69c7f210b9ec…

MALICIOUS

PDF

84.7 KB Created: 2021-06-25 18:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 023d9a4372802fd0d7f52d6e524396d6 SHA-1: 9300e06d8d6aa9a4792c751541659e4dacad9abf SHA-256: 315a69c7f210b9ecd3d97d6b79a7b10f3aa45a7bc86f2bf9ce91ae750a45f664
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure as a link farm suggests it's designed to redirect users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b0f6393cd---gevosoleworijoguxorige.pdf
    • https://supermagnum-bg.com/ckfinder/userfiles/files/gubesebobopurezajo.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b7f48385---63745473369.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160784a8a592f1---48939247267.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/4747addca407221258fd466403f9f97e/delekosa.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/7dd63bcc521bdbbb109ea160cf0886d5/dudabapumemiluxitege.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6ea0b96fa---69222116285.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/h8con9b2pu0elci6mlbt7tv647/xulozirobazosimem.pdf
    • http://jjinline.org/file_upload/file/talemozegi.pdf
    • http://dezmaster.com/userfiles/file/duranawurerazerame.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff99227493---dojij.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9add6a42565553dec46efe9179c0304c/genazes.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083ed890349a---63383832138.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7afcdc32a0---43778770844.pdf
    • https://chptravel.ir/data/file/83661127559.pdf
    • http://aarogyamedico.com/userfiles/file/77083269430.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/a03ac2cbe553a09572344ece3543640c/55813803508.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/ba9c276e268b212358c66f9adccee118/zenubebanekakudufile.pdf
    • http://aldo-ins.com/userfiles/file/kunimajezanabiji.pdf
    • https://turbooto.vn/upload/files/75461262175.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/didolaroganikevasaxupuvif.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/qdgb76cn4q39n5n1qi8q13a0ku/lulolapagamiwofewine.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edf4c8f0fd---51493539260.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c824bae8c6---72291968395.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abaac3097be---81992711681.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/6359597f48cc72c1245242a0a9bb2814/38270681537.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=spicy+green+beans
    • 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_off0000e8b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B7 16792 bytes
font_01_sfnt_off000100ce.bin
651b6590821bbdc4abe35706379bc20618aec47b6a95da7b4ef6297466796845
pdf-font-stream PDF embedded font (sfnt) at offset 0x100CE 10616 bytes
font_02_sfnt_off000118f6.bin
217d7197da84b5bc2888ae64037dba39f1b575e9f50a7ec5432a05849ec37e1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x118F6 17060 bytes