Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f04a4d633f3e22…

MALICIOUS

PDF

86.9 KB Created: 2021-06-29 11:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a5aff5363c4eb21d596a222d7c16540e SHA-1: 2c4a247456aaca2b63e436ed8e9b6a06ab78b5f3 SHA-256: 95f04a4d633f3e22c75b76df3fda2765e3cda2b60f5041ebb477ff8cfd92a2d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm that points to compromised WordPress upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5223e3cd7---vewafigopimiz.pdf In PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/12064627500.pdfIn PDF document text
    • https://htchninc.com/d/files/tebar.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d02a440634---nozuxefarozuxilukezuvemes.pdfIn PDF document text
    • http://ledson.ru/upload_picture/pularuzawavikinisaforim.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/6hdmfst6nu54v919net12shcaa/manedaj.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/2027efdca21b06ee5c3234d194db67f9/fulosasuwavemoto.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c56e0e4cd---24656862185.pdfIn PDF document text
    • http://apcmagon.com/userfiles/93874453045.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a84713502d9---vojabez.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/52369257172.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff24ba03d6---41546077026.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/34411372976.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/87576908559.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084df11b7d84---36622460122.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/45625715651.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/uj6qjlqcta1dsao6b4ecc4cu1r/65471338846.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/49479137054.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071f41b8f788---sivomuwejovez.pdfIn PDF document text
    • http://jarosi.hu/files/file/sinaganonetidaz.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/kevop.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/97660859169.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/5doeq6jgcl145tvo8pg2fr27hj/vuxenofoxusosibi.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/57332cfagup6jao37ldl2nn6k4/24784911034.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/kisefopenobupovofejanuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=legs+feel+heavy+after+workoutPDF 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_off0000f048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF048 10712 bytes
SHA-256: 0243fa6172a24710090e8f2c19c6c8d46c8233020c56685667a3b0422df96eaf
font_01_sfnt_off00010929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10929 17260 bytes
SHA-256: 106e03f879ee1cdab847b3e46f518d626a3fdf768f67142b22a9cc65ddf8c323
font_02_sfnt_off000135f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1