Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bdf97b82a3c4ba9…

MALICIOUS

PDF

114.2 KB Created: 2021-07-13 16:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 3d0799ebff4bd5e24a5ef283bb896e9c SHA-1: 3df43ead61d7f8f39a0d3d2d4016b7ed96d76475 SHA-256: 2bdf97b82a3c4ba97e27859895e388f7b53ddab3ce257a31a77d783bff8a5da9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable domains, suggesting an intent to redirect users to malicious sites for phishing or malware delivery. The presence of external URIs and link farm characteristics strongly indicates a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://synerhu.ru/uplcv?utm_term=foreign+trade+zone PDF link annotation
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/m4t9phs49pj1bmjafe6fofod22/28827008780.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607283b293814---dotagitegub.pdfIn PDF document text
    • http://juha.be/_files/file/laxan.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/87160359982.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/38655905262.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/71100964959.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/9133221322.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c74d7ba626---54399207261.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079734497176---69100724712.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/guwisevigatetezese.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/murisotonofazofumemudif.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/205b4b13a2d0e0388d43f90cd8dba33e/mamuludijiravurul.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/keqihv0vs9tid8ob4vnh1q0kc5/kinuvibazogew.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608354f21a615---dopabasukasew.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16095dd5208682---46934557851.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/65973422121.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/nevuforifoxadavowelu.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/bufumaga.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609855927f30d---99432156336.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609279322f320---nepegijisotilobaw.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bc2a562df---nedubisofubixenuwozi.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_off00016086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16086 16972 bytes
SHA-256: 9742ed1ce78980bb9d7d0a9b70ca66426444b9204a3cb844626c69ee84a71f38
font_01_sfnt_off00018ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4E3 10244 bytes
SHA-256: 619d9ab827bdcd70f017b9ddac40ec935c7c33459957e1aa358b9d53863f8dc5

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