Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f883251a62a5b28…

MALICIOUS

PDF

88.3 KB Created: 2021-09-04 00:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 350525e2d24d2bc062247ee4a3921197 SHA-1: 3f3d647ee81ed1c40c4dbaf4230228aea635da9c SHA-256: 7f883251a62a5b2895f822314af0e17a830492b38f60cdc9ce34c0b09bf87946
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://allytemp.ru/uplcv?utm_term=autodesk+vault+2018+pdf+publishing PDF link annotation
    • http://nt-module.ru/ckfinder/userfiles/files/50489803345.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7aa97a8128---81240392785.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/taletiruzilalevepoponax.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/vezifevuduvone.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/6d271d5ed90162266e7b04ae92b2e309/dixufi.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/14865375223.pdfIn PDF document text
    • https://equimat-cheval.fr/file/94964226521.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160770e792a5bc---5131712206.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/womupi.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/burevukezebobopukuxobeju.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/95721657724.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/20762594911.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/nunorimejolakawore.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/jafikalururuxegulexibajo.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/8gqq199emf9of0eqplka61lfe9/53612255447.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/wevumuwetazufidulu.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/59b809ad31b85ac55b77479072a79349/48584902161.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/vukezegexapumi.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/xomanasolurolurap.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d8a249e6076---kemuxapu.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/wadewuweve.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_off0000ec35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC35 19940 bytes
SHA-256: cacb211bf832f99bc3911e4ec2a4892cef90d1719cac3ec517736882841a214d
font_01_sfnt_off0001201d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13834 11560 bytes
SHA-256: 4cf2451b9d68571e5041d1d7945906e40d5825b43230662d922b53fcf84dd900