Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff433454c1e370a…

MALICIOUS

PDF

119.0 KB Created: 2021-07-02 21:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ab08c503250086372897b10e8ddb9e4 SHA-1: bc9060969c6a65ea68e104486752c5f240361ef7 SHA-256: 6ff433454c1e370a5d6d7512c66ec1a66e240b5e528b8b8411c6c5c08e0d9eb4
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of these link farms and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://pixomot.ru/uplcv?utm_term=the+secret+tradition+in+arthurian+legend
    • http://hb1004.com/userData/board/file/51165583557.pdf
    • http://93564497.com/userfiles/19020521118.pdf
    • http://naturallabs.fr/userfiles/file/zosezinufepinexujavukigel.pdf
    • https://aartipalette.com/userfiles/file/revedovixemubaluvof.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/4407dc9d24df41524f629acbc80a3016/sudine.pdf
    • https://aquarell.ro/userfiles/file/zukekatutifuti.pdf
    • http://nguoigiupviec99.com/webroot/img/files/kadesetodekedaroju.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/ablu23h0ms5nb6h0m5s66l45pf/josinubo.pdf
    • http://laiyi-art.com/userfiles/file/55110135.pdf
    • http://ecole.ru/text/images/file/zotabuvusapek.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/hejuj63k4o10juf1qqa1sksvjp/94092263980.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094df615c5d2---viramawel.pdf
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/u868a0se33ddgioi0do4mt9cns/76283245384.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085c2813ccf7---risosukuzugofejibawevar.pdf
    • http://penzionklara.cz/userfiles/file/69697519361.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/cjdkrdfp7ac0be1lh1eun42vib/48491957130.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/bavuxosikib.pdf
    • http://medi-sen.com/files/files/filavutididinuxet.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3858222eea---xaluseme.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160876acf3519f---68256510517.pdf
    • https://al-farh-iq.com/upload/userfiles/file/37608375744.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba38fde609---joxofazo.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee3b5c374d---24704906182.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c491184c324---gebitosov.pdf
    • http://ankaser.com/userfiles/file/56903949975.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_off00016f2d.bin
2046410455488048a6e551eaaefb8d7a62aba74d1c49fa6d49b02b6865ac2fdd
pdf-font-stream PDF embedded font (sfnt) at offset 0x16F2D 18240 bytes
font_01_sfnt_off00019e03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19E03 16792 bytes
font_02_sfnt_off0001b61a.bin
da782853c92741481c8764aa1d5c5043952b2c0291130ed6d465817b9a4d4b83
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B61A 10712 bytes