Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c717bf44c0d3f3…

MALICIOUS

PDF

76.4 KB Created: 2021-06-28 18:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 128d2016e8fee26f5670158afcfe93f8 SHA-1: 7e9d80f5632fd95ca43a580557979658859275f6 SHA-256: f8c717bf44c0d3f3237fc58567da948473967e7fdfc05d21da725ac633a2bae2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://laborke.ru/uplcv?utm_term=your+english+is+a+pity PDF link annotation
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160946c386c1e5---nuratovi.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd25949200---pavofirusurovotokegafite.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608085034092d---falopuwok.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/demizejotijig.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b05929d6e67---21029225280.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c877968dc4---40222495459.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c106310073b---kogipewakume.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/s17llt7ef8j8i2e0otvmadv4lo/18006667303.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73b8917203---zitobowuwoderu.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/4dbf910a64616f79232896b44aa79c48/80525660330.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd4bf66aef---61835375428.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/4441899944.pdfIn PDF document text
    • https://mahae.hu/files/files/13814880368.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/5e3edb7bed53f86d6f1edd4b09cadc8d/revixotol.pdfIn PDF document text
    • http://www.emailposte.com/pictures/luxodavatuvuwibosebew.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/nodukenamijifaparifepovu.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/782d6b30d6010cf62aa1bf94bd0ecefe/tibezibanojixegofimol.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa67d04291---36330700208.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9139e7488---noroxuzujos.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/tozuvot.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/a02f40700e3e8dfc8681dcf7b2d959ae/wajogufesuxirabiz.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/1aca2378a020aedc4cafe9b3e89b8bc3/zusol.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/rafezuzu.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/94493922491.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_off0000c20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC20D 10728 bytes
SHA-256: 459be18a91c68390e356cc8ba469bd268fdb2703878fc8c008797b4cdac1e531
font_01_sfnt_off0000daa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA3 20692 bytes
SHA-256: 64a7117463b82630a51db8d5d86d868933ad0c6d1ca53db7c824b10f9471160b
font_02_sfnt_off00010aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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