Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e63a0bc385dde85…

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 19:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3fac0534d9da3a138e7f8750ded3f3dd SHA-1: b3a2b072171a52c94c777b4e40861ac2ded969b1 SHA-256: 8e63a0bc385dde856f992c702e1369cd070d3c7c7edd72fb236dff7ceaa88458
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://coretry.ru/uplcv?utm_term=pdf+to+word+offline+freeware PDF link annotation
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c06c9bf6e1---10638474414.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/tefixiruwebe.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/wuvanovasixiruzi.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/71075178891.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/nisojedul.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a68806c3---11780105988.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/62106492258.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/0c4c65eed2bcdd5e159de4450e229c30/60240660133.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/43357161963.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608596c0d35f4---nozetulufebadunexata.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/xetos.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/70508770314.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/5895fc124f1be0e749ab4c0083e384cf/tasifiz.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cd765415b0---43104514867.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/85739889255.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/tupoweva.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/zorixuwelotezutisekosunab.pdfIn PDF document text
    • https://airshow-bg.com/file/34519616084.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6026caeeb---sagadiguxisubino.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/kudidumifikodo.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/238906123608d298241ed3.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e73692687e7---23306936350.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/didokupipe.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/3494104613.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_off0000d07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07A 10268 bytes
SHA-256: da24d70553c2b19f799c6271f971a1dd49612e14e3c598a45308a98ce89e6d39
font_01_sfnt_off0000e7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B1 17232 bytes
SHA-256: d8bfd7660d2e24ee81c87ae5fcc59d8d4ceb8c5b5599a34cb0320d4aeeb7df26
font_02_sfnt_off000113c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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