Malicious PDF — malware analysis report

Static analysis result for SHA-256 50791384a01e2836…

MALICIOUS

PDF

89.8 KB Created: 2021-10-20 16:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: f30834390f4ef4080e05eaa8ad7382d4 SHA-1: 635cfb62ac9e1c374ac60c3c4952756ae636ad33 SHA-256: 50791384a01e28364b453b7e8d0c7d641ecd44111f9b894cc4d08639d57a8d7f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous PDF link farm URLs suggests an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://asid.rw/userfiles/file/futerumedunazuboxuroli.pdf In PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/63772933004.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/b5bc85b6d09dc4d35fe14891c90d58ec/78145945335.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/juzamunotewore.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/balizevisik.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/lolamobisobeviwewasinaku.pdfIn PDF document text
    • http://koddous.com/userfiles/file/mebotoxeje.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/7feq3sjgm93n710npieipfi8re/tebibaxexudiras.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/12661859156.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/90648475547.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/3468591676.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614dad4561031---65934533474.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/34100468833.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b70da68c1a---gukevutozefofupazexu.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__61386497EE7B6.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/34606918096.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/fozegikelimowofigijimu.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109081101233904.pdfIn PDF document text
    • http://apicn.net/upload/files/67287920278.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109021928143848.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/89108285174.pdfIn PDF document text
    • http://euphoriaclub.fun4two.pl/uploads/assets/file/77379116517.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/99386804435.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471475299d5---991393292.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16163114ac0d39---jefijapilalesemopuxozuna.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/BcFPVxLj4jw/uplcv?utm_term=middle+earth+shadow+of+war+ps4+trophiesPDF 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_off0000f84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11065 10648 bytes
SHA-256: 29cf934d95bccfb5e8798c27980e08db388fce47700b2ce90dff24b2da9b7104
font_02_sfnt_off000128fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FC 18812 bytes
SHA-256: 143b052ae6f80923c06c6fb93d58126bdcce8918a7030d506df787a2bee796dc