Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c3fd8e82edb77c4…

MALICIOUS

PDF

94.3 KB Created: 2021-07-13 11:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f31bbe75bf24ea6404bfcb5393b6365a SHA-1: bdcd5b8f8c7fdc34055269bf57acc7ab6666990b SHA-256: 0c3fd8e82edb77c4d6bd8d4fc26988d1ff70e69a85e6090c748e18bc69cc646e
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f37426d5ca---xufifurugonegip.pdf In PDF document text
    • https://securitegenerale.tn/userfiles/file/11165801154.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a72ec17b7---woxafivodoruveledi.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607af1d274d2c---68896447744.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/4453ec17fc6a98f37a19221a315d40ff/17443747428.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/lofiju.pdfIn PDF document text
    • http://azizolace.cz/images/file/jizotivagavenevevuz.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160873fc19d37f---bitidezifomitimuxunu.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/lanezaloxavorokomifeziwo.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/betovuj.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a0706ae72aa3d524ddc0b289bb5d0fbc/sotoduximedazowivof.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/16696340710.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/zumapox.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/mebukapalavemuwogakoxepo.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/besikekorezowemuj.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/bad0a6959b2db8b980d9b4c4392549fe/60664255036.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/m9h735hhuakq8usc7668fqg122/17127273180.pdfIn PDF document text
    • http://placc.info/up_image/wofofavixesulazos.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/54795201417.pdfIn PDF document text
    • https://ewt.cz/res/file/fuganegigufadobuw.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/tusivojufopumifubibijog.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcdab2d467---77842263785.pdfIn PDF document text
    • http://momsystem.ru/public/file/18344124128.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/aead66ace0a764a8436de920a2a1c6f6/24967154075.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cbe12a528---27851040858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=distinguish+between+mass+number+and+atomic+numberPDF 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_off00010599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10599 11096 bytes
SHA-256: fcba634becbfe4fd6d7c1513266a248064581b152084d494cc1b586bd906e2cc
font_01_sfnt_off00011f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F25 19652 bytes
SHA-256: e198c893dba58fa68a06800ee48dd885bc51e870ab15d2b14377cfa3bb284bbb
font_02_sfnt_off00015358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15358 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1