Malicious PDF — malware analysis report

Static analysis result for SHA-256 582511ba15eb38dd…

MALICIOUS

PDF

76.0 KB Created: 2021-09-01 17:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6c5ece0ea873c2c751105b6485aa87f7 SHA-1: eb0d6c8d235dd8ef0453d896fb15aafd6ea3011f SHA-256: 582511ba15eb38dd19a33324196641878f8afc48c9d201c29bf55d40a5a587db
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress sites and other PDF files. While no scripts were extracted, the embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/9ekl64qifujt1mhq5vdp21sit4/59250344655.pdf In PDF document text
    • http://akcjonariusz.com/UserFiles/file/pobitewolunojidofomaga.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/33441449258.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3bf9f68146---kemexibabupubazilowujo.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608d79f2e06d8---diwukerugusafuloxoxuxi.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/c9edcc4704bc777eb56d366884476b84/bozopifodapapegudepasefa.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/27902335419.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb3fbec62a---riborarigodokonuxaxis.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/abe0bc6076d71c847a068bfed499d8e0/63074108673.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/36ac750b1dd8af6d6186d0da7c00ea49/74974162844.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/marawuvewatuziwufapojote.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607502cf4d588---gezegufu.pdfIn PDF document text
    • https://menu2uplus.com/images/file/6509053212.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/26538178166.pdfIn PDF document text
    • http://ukuleleceilidh.ca/clients/860383/File/deruvirezizawajon.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/39715225391.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/14514f16f04d71bb01e003f4aa01e0f5/moganulofapumot.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/tizonedoxadufi.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/23153708240.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/53654931025.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/93102255036.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/jenoxes.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/xifisojugabugawuvipiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=unable+to+locate+package+checkinstallPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/48097876450.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_off0000c092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC092 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A9 10792 bytes
SHA-256: d82948bed17361e919c50a2c030e0a636848a9db00f276d885bd6763c2162237
font_02_sfnt_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 18744 bytes
SHA-256: 526eb926d4f5458673f9daf109df65303f3f002e786e859d3500906a5030a727