Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c382f0b41188f35…

MALICIOUS

PDF

86.1 KB Created: 2021-08-12 04:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 472bb4805089c7fb4aef6410fe1b04b4 SHA-1: d3e163fa37b708c1e18587a60aae3c6f25e6ed1b SHA-256: 7c382f0b41188f354504de8d301306d8e51e1003abab692997b7bc32ecc101d8
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lure users to external malicious sites. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, further indicating a malicious intent behind the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://sgcaregiver.org/contents/files/suzodomanawu.pdf In PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da362fa42ba---jezeduwigomasinur.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ce645520a---27569005354.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/nikadunukef.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2b856b908---vunugije.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/89d0223bc99a6ad2a672ef3cb06dbe4e/65489401581.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/78252831457.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160916bdcc1ff7---wodobizikikejuzetukibo.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/82082347605.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/c153l3b9bu8bagajb4ki2965m7/8575701865.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/nevute.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/30178399099.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160982a1f3a02d---bomilewasaluxuwakiteg.pdfIn PDF document text
    • http://huiking.cn/uploads/file/130451474651.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/28490006300.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/niwarawovoxa.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/jumalalogolafevojokizepum.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/35262254581.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/fbf445efa2bcd2b4afc61c85a5e4524e/fofupolivimajimezutivovoj.pdfIn PDF document text
    • https://vieclamhanoi247.com/upload/files/40167155008.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/lewefexidomoga.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/32319384318.pdfIn PDF document text
    • https://longhoang.vn/upload/files/jumitibisefitoperes.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/jidomuporaxetogazo.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/lulelinedo.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/seboraruji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=very+hungry+caterpillar+free+printable+invitationsPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/vemafujogesogosewujur.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_off0000ebc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D7 11148 bytes
SHA-256: dc932685eef9e86d05c13adff0222e25b775251553971bf4189360a814285e5c
font_02_sfnt_off00011da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA4 16992 bytes
SHA-256: 38489500f0efba611c1a987cade5810789b37cba6dd23b5bbd8ac20b7eaf47bf

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