Malicious PDF — malware analysis report

Static analysis result for SHA-256 f375a6cb77cbf275…

MALICIOUS

PDF

84.6 KB Created: 2021-07-14 01:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 695264758e74e532cf8bdf8770acd040 SHA-1: 5a2e5ceeb27554fd246b6a0233040ab9d65858ab SHA-256: f375a6cb77cbf27598c7d7fc3ea06eac07e41a625f22df9942325d4756effa93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://getem.eu/files/file/28882513474.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16082bceecbb7c---bulafizadile.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090eab4b1c9b---26817481233.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160794202768c2---99752779223.pdf
    • https://communeouchamps.fr/userfiles/file/9808570117.pdf
    • http://biosafety.biz/ckfinder/userfiles/files/92481015368.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/t7s1ssdkr17417bg4aj1rbln36/jomatog.pdf
    • https://commonwealthsportsawards.com/userfiles/file/puxevamoluzumafezipotudig.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad047e0fc76---buned.pdf
    • http://patroha.hu/file/87686847467.pdf
    • http://lab4050.com/upload/editor/file/masufuno.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ae134fa71---gatepasog.pdf
    • http://kemenyseprosiklos.hu/upload/file/15964080759.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/01cc89157dcbc791f72b8ba21a3117dd/duvolupokexato.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081b8f6e8257---nimosubakimowojuluve.pdf
    • https://pmms-online.com/assets/file/23280557960.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/7h6m7l7t67h0ab27chtp62bb9n/wibanutux.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/5baa1e06a3bb260da61be002b13740fd/43906763195.pdf
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/50935165688.pdf
    • http://hermangroupcorp.com/clients/3/38/389628ddbd62db2fa1e4299ecdfc1861/File/10886554479.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/tesaf.pdf
    • https://walkandsmile.com/userfiles/file/84897984727.pdf
    • https://nikosdimos.gr/userfiles/file/jogesev.pdf
    • https://global-brand.net/userfiles/files/18807734869.pdf
    • http://viettelhaiphong.me/data/dulieu/files/83786283676.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=when+do+we+use+modals
    • 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_off0000e7d0.bin
e4cf239e83528ea5a7ad421c4172e0ae4560e9fa6e66f5f5bfc280271710901d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 17508 bytes
font_01_sfnt_off000115a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115A1 16792 bytes
font_02_sfnt_off00012db8.bin
a850d9e78d8c5aa00e5a9f51c7b374784d33aba34db09d650d4eed387a7464e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB8 10404 bytes