Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85d320ce8004d34…

MALICIOUS

PDF

74.3 KB Created: 2021-09-04 16:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5a084622afc55846eb5d72183143009e SHA-1: 8b3766a50c3166c7fd9c9018eadb03599d767fb6 SHA-256: c85d320ce8004d346a86113bb63471bb7d13842dbd63d17f69a18bcca27d8ccb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=karl+storz+ent+catalogue+pdf PDF link annotation
    • http://soepcentrale-dekeyser.be/userfiles/file/kikodabobibi.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612e827229396---vufekepadidi.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/duser.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210615194943.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16110ea45bc03e---gikixizurimenuzemer.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/sedodobukubu.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b45d3467d4---bofulagizibogi.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d88f2a8c0c1---24064764050.pdfIn PDF document text
    • http://allycatering.com/userfiles/8881719733.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b039395b073---12992362307.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098973172abf---9729407178.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/woviribimagitov.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/gokikaboseden.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/78908854330.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/3ev6ln962cg4o4q0ad2ra84gsh/33587838255.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/uth2k2q5jm5q5u6ba563sdglp8/53684894387.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/golelo.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/60j1ffivnourak15a6p1gqsi2g/gupamufuxaduzewufolupet.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3baf3b9b4c---49285480303.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/92162051154.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e91c917dc18bbb12927a6374e2944f23/kurabuluwafi.pdfIn PDF document text
    • https://rosycaffe.com/file/tanabowajipurarafixazi.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/881e4fda89335f88b44a9f780cadfb68/vosodijetufowe.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/xuberurevenema.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_off0000bde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FA 10856 bytes
SHA-256: 668660d068b2af13996a3b5a8d7a29262ffddc782c010f5ee5727582da5aaec5
font_02_sfnt_off0000ef0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0E 17268 bytes
SHA-256: f32d9657ac844a03dd73db57d27767047d8014819a30d179dd093963e9969c6b

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