Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d374b4d081b9bb6…

MALICIOUS

PDF

100.0 KB Created: 2021-06-29 03:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b83ca75a2b8ed7956f5756d43b1ca976 SHA-1: a3d5da503e6903ffd9548c402d88977eb7b38fae SHA-256: 6d374b4d081b9bb6ef8a503932b26a201c50c77e2ed72e69f2fc2aeee0556381
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e5b6276e9687859b91b36d26d469dccc/negowilogewasofixupaza.pdf
    • http://brenno-tojestto.pl/userfiles/file/dabiseleweruxodagokudidoz.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b29191b605b---3740305109.pdf
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/88745857873.pdf
    • http://guojingmall.com/userfiles/file///liribof.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/a97054dcdd6f70b9778a5788048c5510/guvevopugavudonamobarukez.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a425cd518---wimorutumulosadufile.pdf
    • https://copperscraphandlers.com/ckfinder/userfiles/files/98671447503.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/728398de71414065d956e2c3d4d459b5/zukuxalisibulivek.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f84094eb2d5ca6ba3c2e2c954e3f8fd5/98173541206.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f3fe53bbb---10889258871.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81da0c5596---15345083123.pdf
    • http://teraval.cz/res/file/10791557863.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b09b50094---bunevofuxabusoxudiduf.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/385433cd7a1b1d2bff36dbe1f19868e3/30165821659.pdf
    • https://ferest.ro/imagini_ws/zadekimuj.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160964aed48bba---75519038748.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/30f72efb9ffd436f2ef9e3c2951ec1fe/18882918222.pdf
    • http://frezerovka.by/images/fxeditor/file/73314611127.pdf
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/wemanewu.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/ddaae6d67d3266f7367d6472800aaaae/mumunabubibijeketiwimej.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/da0590d9fcdfe4a7405ef191a0d35de6/napokapoga.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607143a51f071---ritisodudemudemapurinofo.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d756479f1---21662750852.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=impoliteness+in+interaction
    • 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_off000127eb.bin
08c82e585f3213a011da8711f1511899d6bb3921063668e59ca6c492ded11c5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x127EB 16544 bytes
font_01_sfnt_off000152e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x152E7 16792 bytes
font_02_sfnt_off00016afe.bin
e2254961264579eba1fb28b8457e5649fb3b688dfc94a9b123130a97cdaf81ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x16AFE 10484 bytes