Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb9044b543dca3f…

MALICIOUS

PDF

72.0 KB Created: 2021-09-19 01:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d8642d0cb8285e43b9d259286a7c5001 SHA-1: 2d481ff26904b95f965ba97271eae3a72e3f0b05 SHA-256: edb9044b543dca3f569f3a216cb5a838e71b2375c295a2cbe5e025aa3ed37f40
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/5bkj0vb0ef0onia95iaerrn85s/mupus.pdf In PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e2abbe3ba---xizepalubezinapuron.pdfIn PDF document text
    • https://polytex.de/sites/default/files/dowojedavuzolorebofovizew.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/70595922005.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210917034906.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/37781372427.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/4469917122.pdfIn PDF document text
    • http://szm.hu/userfiles/file/98862079072.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16145e6f8da7e0---vumuzijojuxej.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/jofavitudozasutoxaw.pdfIn PDF document text
    • http://afslab.asia/upload/files/zusejapufubebe.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/19325226944.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/zimagorewexototakorako.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/55811920873.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/26406097588.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/9813762026.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/xixawanalajimuruw.pdfIn PDF document text
    • https://qkon.ca/images/file/1850341461.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/fakelumavodumakefuped.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/sodijigasexivi.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/kuzefufadizivilejijet.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/xomudobenavedonog.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/lalapijibisezijizetedud.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/xexotonodamepinuninukosul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=mini+militia+doodle+army+2+hackedPDF 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_off0000b98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98E 10788 bytes
SHA-256: bda931dc06657f1a8d5ace64e3bf8954a4b781fd6e603fc365732ba5da5fbd70
font_01_sfnt_off0000d23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4E 15616 bytes
SHA-256: 7d41b59eb6777d87163d3c86564eb8fefc2a30eb85990c755589b5042a29d1c7