Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d683fb4628d03c5…

MALICIOUS

PDF

93.7 KB Created: 2021-07-06 22:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6b2571704361c4c44fce62929766ecac SHA-1: 22a8397650244e112ad2281b8c0f58515a104c31 SHA-256: 8d683fb4628d03c52995096943794c4b3b5a31e2f0f8e62b1aa48eddd2a48171
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress installations, acting as a link farm. The document body is unreadable, but the heuristics indicate a pattern of hosting malicious content on potentially compromised sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/hq387mjb8mdnvc8cfbu3gajvva/redifogesi.pdf In PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608deb39725ea---muzujafu.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/3bc92c20b64e4ac9f3d755db0ddff556/13860603022.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be65adda4de---bijisogor.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c42ba6a79c---punepaditozi.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/55964605464.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/sdi5tistqr64c9406gsbpg1h66/30286101700.pdfIn PDF document text
    • https://arabacioyunlar.com/calisma2/files/uploads/70524453196.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/548998bc64749a96af1b8323af37308d/kijadimegazuvu.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/68478443530.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210627_0dffd.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/1927dc3bad318135c5b637057283afb1/sasosivowujip.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/nchl5q61jknc00gq8ef1unjrn6/tugaretapalox.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074600de5ba4---95207340278.pdfIn PDF document text
    • http://healthywithhart.com/res/file/71254200921.pdfIn PDF document text
    • http://runo34.ru/attachments/file/91356105585.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854c2beed4d---507286289.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105301053582055.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/torazetuw.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/gokefexuburafegilege.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/45876600740.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16086da55a32d1---78637478724.pdfIn PDF document text
    • https://ivanamihic.com//files/29668099576.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7b8ddac87---97541348764.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bedcdc7b59e---92842634154.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/14970836491.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=self+doubt+starting+a+businessPDF link annotation
    • 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_off00010957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10957 10844 bytes
SHA-256: b66fe21a1af1c6dc2d6387fdc3b4d32f2e363049ee01e3185a81a400c8c65ba6
font_01_sfnt_off00012242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12242 17812 bytes
SHA-256: 7d15e8037762a9ac52c87554384d594027eec60558a5dd6bc47c1035e6ecaef3
font_02_sfnt_off00015157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1