Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56079edf8b62520…

MALICIOUS

PDF

75.4 KB Created: 2021-07-25 01:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4d66779a88c8c17e69131fbca507fb81 SHA-1: 968c3aa5642c10fdea757b31294383533d7dc986 SHA-256: f56079edf8b625201539813ff19743b72237592bc5f7ed07a3c9e899876dd3a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://lesfeesdelhetre.fr/upload/files/bidasigifudosonizekuwurar.pdf In PDF document text
    • https://jackyrouxmethode.com/userfiles/file/77514344900.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/wonogakuvavawuzadewukimu.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/06/04/73883870902.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/salobexafujotudosuve.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/jekasanododisu.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/28292cfcbc9ab56cdac7adf1362977ae/ledizokadimineturulunud.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/13297864954.pdfIn PDF document text
    • https://susta.vn/userfiles/file/debovukijedopoforagad.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/gixewop.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/46377477935.pdfIn PDF document text
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/lamapubafe.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/65055849666.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/latubupujosenokekusutegeb.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/d65bdeea08bb60fcf81680091926224c/zorevove.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/jugubupepetijitobajot.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c9aed80c0---mujimamixojafubotugimim.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/69084415468.pdfIn PDF document text
    • http://maihome.hu/admin1/file/zafoxuga.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021718425383444.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/4fm9taqj6t1ekui51ua01ll16f/degurana.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/15227221706.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/nenuwogogolesisonana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+crusades+map+worksheet+answersPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CE 17176 bytes
SHA-256: e6372ee7f96c2c9e074656f3d115461ff05efc51ac719776847d9fdd2049e543
font_01_sfnt_off0000ef2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2D 10884 bytes
SHA-256: 3a1312680d5e37b9786ae018b6f8eef6bf62b6efea831fb4f5f36a76dfc01f0a
font_02_sfnt_off0001084b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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