Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b73514bdc5d105…

MALICIOUS

PDF

86.1 KB Created: 2021-09-02 13:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 79b1dfca982d016bd482af1ff6f1c913 SHA-1: b7159a60e66e281f3cb93437a746e4ec8be47a4d SHA-256: e6b73514bdc5d105a8c82824a8aa7f8766abdb6f72340b42e81dce219ee68851
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. These URLs are likely used to redirect users to phishing or malware distribution sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ClamAV detection and ML classifier further confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=cisco+packet+tracer+tutorial+pdf+file PDF link annotation
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/a0ad75ce669c5a7141137b4fa9131dc8/ralemefukopetiseronena.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/42841051761.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16082c44f22494---60278236134.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/70141282287.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/38068670952.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/sudaxuju.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/daluwaxugabugaluluz.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/bivixizojasikir.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f6b67be00---92301300614.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-1/20210701020258152397.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/xutofeb.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents//files/68303664713.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae1b9af490---povolesowo.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d72d05a519b---kukije.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/dawonafawodonepodiz.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094c7d36d0ed---17085130267.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/70501747498.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/vj4n4mgmpfjk22iskhjnkft88j/14058879813.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/tirezefiw.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef950a1548---boloxoxeb.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/002d132c0289eae5b9803b0b308bfb95/5889341182.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/37842098356.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/cdd57850ea15252362edec7106b9dcfa/19908848380.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/zepoxes.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_off0000e3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BD 20444 bytes
SHA-256: f836b82516d682b7333e9d5b68fa605a14c906bb3cb6c81f31a44f995c66fec2
font_01_sfnt_off000119d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D1 10732 bytes
SHA-256: f6368db235f918a0eac7d66b48ed9d11c1da6655c710fabb9f9e1b91cda72261
font_02_sfnt_off000132af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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