Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8814355a66bd367…

MALICIOUS

PDF

81.5 KB Created: 2021-09-05 09:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d9e61899a4d6168bf583451520cc38f4 SHA-1: 2ba880ab5ea069e8a0f36762eef1aa702191d80e SHA-256: d8814355a66bd367b892d223fc1857948aa16287f3f472f0280101ed921fe687
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other potentially untrusted hosting. The primary purpose appears to be directing users to external, potentially malicious content through a series of redirects and link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/a36e62fdab0b441721a6c125de520d17/19810429840.pdf In PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dccb366fa---91111060160.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/bulamijerukor.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/jajew.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210827152424.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160791c4fdb50c---bomoxe.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/vezuzakusovexanoma.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/bodod.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/jetabipak.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/lovudefixerutitedo.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/13248318720.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e4f9cf6a7---mabejirefixadan.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/vatebugatisiduko.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/21904576788.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/xetudafuregazimugi.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/tijosozatimoselesapilox.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a5cd4536f7---guwezuzazepufojofujazen.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-8-8/20210808095156586742.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/44440077193.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093a5102b4c6---41949897233.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/37716156247.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16120d581d705b---10901311182.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/58967995259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=marketing+terms+for+interview+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_off0000dcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF505 16464 bytes
SHA-256: 740f15cd28f3ee7b2dc7fb44e92f5c435dea28d076442e2a6bd057a90ba11f03
font_02_sfnt_off00011f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F42 11032 bytes
SHA-256: 85c77debca3374dda0b451846f6e5f79048592eab8bcae6feb742cfbd0a12ff3