Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3da1df9cb78ab2…

MALICIOUS

PDF

74.7 KB Created: 2021-09-19 08:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1be2340222e4a46ceaf810e9347d9cc6 SHA-1: 76372b740f2d8130de336ad6270f69c8a06935c7 SHA-256: 1f3da1df9cb78ab220324b5ea2a6ece3242051385719374a3ad727c774b1ccee
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nomylo.ru/uplcv?utm_term=things+you+can+do+on+android+but+not+ios PDF link annotation
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16136f9e8af455---69420672551.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/94495201198.pdfIn PDF document text
    • http://geasit.it/userfiles/files/divinadisotasevo.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/lidesisoridonapipunod.pdfIn PDF document text
    • https://soechi.net/userfiles/file/kanivefinegava.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/sevojofamavazoraro.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mefosinekalawopoguro.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/zibaba.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/kgogr92nv7g6al1voccgrrgkne/85907732826.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/jumolilodamin.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/91010058887.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/91970593510.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/52209628586.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/kozusiriresizadaw.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/43663119967.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/firifivebolut.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614252cc3ae81---zavuvojorosekexadakaparu.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2275c247f---vigog.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/99086439142.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/fumuteranemadexi.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/74504731082.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/742ca80fbe2ded37eddd6863d88a6a36/rajep.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/1c119056efed86d13475f62273f5cc8e/geforulilupawaw.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_off0000c1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C7 16456 bytes
SHA-256: d0852e577cea5090a52cfd3238e1bf05c320d3a7be823e7db2199e66668e9683
font_01_sfnt_off0000ec14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC14 10788 bytes
SHA-256: bb332664242c97b98bedb31587f97fe6bc23f291ce87d4db78408550de9068c8
font_02_sfnt_off000104b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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