Malicious PDF — malware analysis report

Static analysis result for SHA-256 806ca6ed4e5a9087…

MALICIOUS

PDF

76.4 KB Created: 2021-09-02 01:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cf12ed998a5679a28873539d312be159 SHA-1: 2f387e2336cdb25cb6e92f4d2b9decea6074a5e1 SHA-256: 806ca6ed4e5a9087b98a5f5dab111e4526fb08c01b95323b3e45e04e8f0e6dd4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. This suggests the primary purpose is to redirect users to malicious or phishing websites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=i+miss+you+in+korean PDF link annotation
    • http://93564497.com/userfiles/72213495895.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5c6fcb8d0---polamu.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/b2e7d41e32d28ac9a7d69f27b171e4e4/rufukagapexuno.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/92762037578.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/mozajudexetabujopa.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/75957521578.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/gf2n7ilhbm0sg3cis7aai0k6hg/gigivezo.pdfIn PDF document text
    • https://interconformity.ro/images/file/20894586467.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/ecf061f4219ddc2c4c74ba9254707673/24244207650.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/38798752099.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/1iniotm6ge71h9vdo5u94onf42/parozubilunuk.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/govoxijonasisonexu.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/34706226290.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/a36tqh4ke58d0gv3c1rokir8en/60920726463.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/vokigotozut.pdfIn PDF document text
    • http://ahchala.com/img/file/jopijovawufuxipuj.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/tijaremegulijutoguj.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/cba8fc2bf2ccfee190ea5a91a7b170b0/netejepigebotutipotatok.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609456d3cd247---86344561334.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/e173123d4b6e87c4dfdc90d88bf766bd/tegid.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/josuw.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_off0000c20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC20D 19748 bytes
SHA-256: 0478449e83a7cdf4198770a27cf4163b7cbcde736aae00d98bb6b11a11912460
font_01_sfnt_off0000f623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF623 10384 bytes
SHA-256: 25ccac8cecf256aa32ad44a310d0fecd9de318526943ff5e71bd147976c861c4
font_02_sfnt_off00010d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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