Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e1cf8af5c0bc2e6…

MALICIOUS

PDF

95.9 KB Created: 2021-06-25 22:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5739ae4e21fe2b451fc34c87f9632ed SHA-1: 759b67a910efbef69e6dc9dc13a35cf7ea2d1eb3 SHA-256: 0e1cf8af5c0bc2e663c7c2d2c3723198185486de0d1668d5f45105b418633ab0
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a deliberate attempt to direct users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://futurepoolandspa.com/ckfinder/userfiles/files/68281840879.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/19db07e0539523846ae89a0a78559a07/lifetakozawowisesefinofe.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a95175a69---28885462384.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/pq85islj3h0rfl6gqilb7518ek/68748587929.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b834dc7a479---nepitosaritixamigekuxu.pdf
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/fukitejadujezem.pdf
    • http://kup-vino.cz/web/ckfinder/userfiles/files/gagafojituni.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/85acc1116c413613cc6f4d4568555b73/wapobokujejoxu.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80c44619bb---44357752718.pdf
    • http://poltinik.ru/userfiles/file/82436075110.pdf
    • http://studiobardinisrl.com/userfiles/files/77594312662.pdf
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/lmlr8rr3r6pbo7ltmqpk5nnsva/93710999787.pdf
    • http://evergladesharvesting.com/ckfinder/userfiles/files/45402337067.pdf
    • https://fa-vietnam.com/webroot/img/files/4458307384.pdf
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/26746674557.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/fcf1bdb09bc2a24654756fe7425257d5/repadudel.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f58f486e47e7d1f680946e15a30f61c9/zisemoruvazedobotujutibep.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd14472e24---pegekamobez.pdf
    • http://chekeeh.ir/basefile/chekeehir/files/16488699957.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/80010839670.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/n22rqo1ij0qm38lkod1b5n0jv3/jebupefefadomodanuxuvulu.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/ba024c24f509c6d2f554ff018d6c19e6/40889228539.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/34880d4fae594c62c7e442c47581ca50/63216879812.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=stereophonics+tickets+2018
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001127b.bin
3626d760b144f85cda0f12c1ede759a3f03dd579806edf78a3e80eff02338b7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1127B 10932 bytes
font_01_sfnt_off00012bc3.bin
341b7e6543d17730cd664fe554419ecce8bf5973b2b9984abc862ce950233b7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC3 17276 bytes
font_02_sfnt_off0001593b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1593B 16792 bytes