Malicious PDF — malware analysis report

Static analysis result for SHA-256 68b64ac55ae45abd…

MALICIOUS

PDF

87.5 KB Created: 2021-09-06 15:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 343d59f89058f542f2e9401a7ebfa9b1 SHA-1: 76c5b543ae44c591d1eb1d7736f12cf27f78d795 SHA-256: 68b64ac55ae45abd1c3b16e2217b55a6ff58342706c20b727930d115f1f50678
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/e2b64fb3a674c373e104d1d90e27668c/rufumazitarudelu.pdf In PDF document text
    • http://evevoyance.fr/adh/.-/file/savizig.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/70973104175.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/6f04bb32431b7ce64c62875181243be5/kufexevexapujexuzovubus.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/36548637961.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/c88214ee0e701868513c48beacf157fa/15322933469.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d81dfbef478---xubima.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/46390944071.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16135eeefe1dd4---51237155256.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/febakodu.pdfIn PDF document text
    • https://gangnampools.com/contents//files/61925385260.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/bajibijuwadupupopopevoj.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/96402879998.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/telepexisodibaxoze.pdfIn PDF document text
    • http://rld-carbon.ru/file/gapodipivamelorozujawo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e04ae116a8---jipagemotudavitowivuzevag.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/jinisubadoluriwojogewedo.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/l9al01vi2r4jpvdrcq27ttdomp/31966221729.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/4213988427.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/6188553124.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/39576949145.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/xukobixosewijifoziduj.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073539f6ce79---93283616770.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/bc60540c3a90bd471c9a16b99f151a02/pekimafixerupebujuda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=sustainable+construction+materials+and+technologies+pdfPDF 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_off0000edf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF6 11380 bytes
SHA-256: aeea7352ce553084e168b29bc94e2c884cd5063c8d9a7e584dbb5fc3455d6bb4
font_01_sfnt_off0001081f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081F 18912 bytes
SHA-256: 500a7527dd7ddd14c95bfb15644f2008ebb6640ec0b0dc7f687d9117bb1835a1
font_02_sfnt_off000137ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1