Malicious PDF — malware analysis report

Static analysis result for SHA-256 3532fd1ab043e9cb…

MALICIOUS

PDF

76.5 KB Created: 2021-09-05 16:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cabb0d1a79db30d36b9bf74bd5c1b8fc SHA-1: c782e192378c4c3b851230daa24152a143ad8dec SHA-256: 3532fd1ab043e9cbc63f88b6264e69cb548c5d10b207c524f8a4a32dbe4fbed3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://medvor.ru/uplcv?utm_term=2019+ford+mustang+ecoboost+premium+manual PDF link annotation
    • http://www.farmaciapenil.es/userfiles/files/17644949352.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b013ecb9a6c---wenekumugelabixag.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/35981756507.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/53041271038.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607945666d235---66884462406.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/264ba36ab6c4f9f9774f3af2dba35438/zusunit.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/81de0673491f56c435425da0d20173aa/79080694498.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/77151518005.pdfIn PDF document text
    • http://cocoal.com/uploads/file/gatafu.pdfIn PDF document text
    • http://www.celso.org/download/xegemezuwadibimegevin.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/patulesoluluvufob.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/50491700430.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090b8eb092c1---99501287404.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/kejedasavujubinaxi.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/0gvsqe6h5kg4riemp17hbuvle0/81774602176.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/wowuzovemefalesasume.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/81758020940.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077e7c34a688---jomidetigazamifaworisage.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/bibarexivutumijozudegasuw.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/lugubovanopup.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/pofotirujunusobodedam.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/kulepo.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/34796460ddb85b695b5c7e81746285a4/jedamulekutagimajofuve.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/37518068506.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/4efsv6u246op3atir8irp9nkt0/vuwikejepizivujezebaxu.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_off0000c4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D0 11568 bytes
SHA-256: 14f235b155bc887543f3586828c004f13621a0aef0591ea1b469971a2fb87c65
font_01_sfnt_off0000dfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE6 17040 bytes
SHA-256: 4b0ac02fcc702cbd98c9912d3feeeb4c8f8f5b812f5e7fca3b9e7aa4eae31df3
font_02_sfnt_off00010c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1