Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf44d3ca92f933a9…

MALICIOUS

PDF

79.1 KB Created: 2021-09-08 12:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c42cb436a895c7694891ac311f0dd7ba SHA-1: c80058a5fe230e0b7417e17c9d69180b21389c2e SHA-256: bf44d3ca92f933a976eb172edef264334346f5b7bb02c6666b816dbf0e8f8afc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URI links and link farms further supports the attack pattern of luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ketchas.ru/uplcv?utm_term=access+database+manual+pdf PDF link annotation
    • http://capthepcongtrinh.com/uploads/news/files/62811267397.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321b9c53785---46808321702.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1630877785.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/67657111221.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/kovuwuxadolakek.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/nuwajuba.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/pcn7vkg46qfqggsf6pqfespc76/70542158489.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/79603803587.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/wobezaderuda.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/51022237721.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/amdpe4acnmf0f6ck71vh1efmj4/65466760378.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/60587235696.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-07/dc4858ca69e80fd22a489232b982bf6f.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/60743001353.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/50208264014.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bc790ade2---laduwelufedotiju.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/9913775004.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/68357728413.pdfIn PDF document text
    • https://papiratisk.cz/soubory/kosimejivomujor.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/nelavunibun.pdfIn PDF document text
    • https://labelmarket.eu/data/file/83489467201.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/65628156241.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_off0000d27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27B 17012 bytes
SHA-256: 6d5b9fa9d40bee63545641a84b60baac17471aa82c1ac4ba7eea4528f096f695
font_01_sfnt_off0000fe61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE61 10692 bytes
SHA-256: f0fdaaa4047eadad5339dfe5aa5de027163d2bbd9bdb97c72f8621c5d9b29174
font_02_sfnt_off000116b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1