Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad6a0d6bd0286f9…

MALICIOUS

PDF

83.1 KB Created: 2021-07-02 15:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05aa00c90890cf1feff3acc4dd7c4443 SHA-1: 6606a4966bc336682ea018b7cf257f465f670ccb SHA-256: 4ad6a0d6bd0286f9ef6cc60119a0e4ed4e569e72c5605ede7cc9c93312920319
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or malicious content. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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=paying+hst+online
    • https://amblamy.ee/upload/file/74297736459.pdf
    • http://gelateriacool.it/userfiles/files/nofeneduneri.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/153de3bf5b6763fe174a064586d1c8ae/dajizogafaje.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/majikanaza.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071abeb880ef---66780100563.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/3a438867509b45c3ca0fdaf9340a333f/10185537544.pdf
    • http://koreanhotpot.com/uploads/files/dipozajagufituwesalijomu.pdf
    • http://thaoduocvn.com/userfiles/image/file/misusipil.pdf
    • http://ed-web.cz/userfilesfile/40706943986.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/q0j4t5jelftom3uh7ble74s34m/43081037362.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f71c17ee5b---duwekezizuxugedob.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f289acc8db---zonigidifigidero.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2cc18fc31---kulevatinekeg.pdf
    • http://skncn.com/u/files/39052973958.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607f983f4d92c---36306375642.pdf
    • http://otvorene-srdce.sk/userfiles/file/bodukenaforukaxafode.pdf
    • http://agisma.ru/files/pages/files/jigidolaverabu.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/ltj7bl5t80qa6jhlrv7ftgf894/12248963350.pdf
    • http://espacioschillout.es/images/admin/file/vesukeberofediwi.pdf
    • http://bright-inter.com/file_media/file_image/file/74505647187.pdf
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/banuzadebikironut.pdf
    • http://pwmtqatar.net/userfiles/file/bofere.pdf
    • https://nikoljski.com/ckfinder/userfiles/files/97031168786.pdf
    • http://nuestratierrapremios.com/campannas/file/88022712785.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e376.bin
6ea6aa15dd1add27432e1a1b6f766547e524f5fa6e4c75625e05cc6929300b98
pdf-font-stream PDF embedded font (sfnt) at offset 0xE376 10404 bytes
font_01_sfnt_off0000faf9.bin
3febaae18b07b1ec6270df987b546025c5cca6430370d428d26d3f7e85e9f1b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF9 17024 bytes
font_02_sfnt_off00012720.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12720 16792 bytes