Malicious PDF — malware analysis report

Static analysis result for SHA-256 4260d06eb6ecc1fb…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 05:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 446e0cb39868b111c28f5c2fe923a4f5 SHA-1: b5099ecefbad735a292bf546c12bb4f26f9b36a5 SHA-256: 4260d06eb6ecc1fb7ccc9518ced2095a3f3ddc70a1f8a65d0bbb6deafb5b0b2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics identified the PDF as a link farm, with many links pointing to compromised WordPress sites or disposable domains. These links are likely used to distribute phishing content or further malware stages.

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://queure.ru/uplcv?utm_term=opera+property+management+system+manual PDF link annotation
    • https://muratay.nl/userfiles/file/zesaz.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/wizuz.pdfIn PDF document text
    • http://rs-entp.com/upload/file/60753720244.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fca1841e7---49686859358.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609899f353128---vutazemajanagu.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b023045e0---35035088237.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/pikiruzuzuw.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/metilumesusa.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c214b3572---lozijojera.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/pigixeduvopiri.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/kavavotoxuxalaluzimom.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/qf4nbdvakcv5idt9hhcl4ub874/61042185886.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/b2cb693d23031dcd3c050097e3856803/gadik.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210806184341369949uh22no.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/1a387d47cfd84c8c68770788519f954d/96161667448.pdfIn PDF document text
    • http://dhs1959reunion.com/clients/871764/File/75696101312.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/fimawubajetunagosaxola.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/gojobevinoresij.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/b74970f8128b5aeeb8fc0a3370eccb60/menepiwabefuk.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/nopamojonarenojasepexuw.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/52869094319.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/eeb26081774baa62b8252897abe2acfb/sabit.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75300a28ab---jejaratevakewufavobono.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/66228590445.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_off0000e119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE119 17612 bytes
SHA-256: d27072e686ecee3f95f4e2719dbd8b241998e9268df9489fb58ca79a9d2f0165
font_01_sfnt_off00010e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E62 10744 bytes
SHA-256: 13fc42be78e46f82b97be7e815c999136f5317b23857f398775affc82946dbf2
font_02_sfnt_off0001272c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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