Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90306d79cd0f1d8…

MALICIOUS

PDF

146.9 KB Created: 2021-06-27 02:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c528543cfcfc15f94bcadae5b31ba839 SHA-1: f6fe3c3f0365e1530cab75030ecd5620f8e488d9 SHA-256: f90306d79cd0f1d8003d1c48c17ba164d399f31066ff36c3af6826ef6f2b925c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is unreadable, but the heuristic firings and numerous URLs suggest a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://wsbtitan.com/images/file/kenafukudivate.pdf
    • http://andlupa.com/userfiles/file/ladagaduwanaxanebolukim.pdf
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/nejonufig.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdac66edf4---54313961360.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16072483507f8a---37864700782.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f275277a99---35136235286.pdf
    • http://eska-lift.ru/userfiles/file/96132519665.pdf
    • https://serka.com/serka/upload/files/27476637139.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cbbefc4dd34---wamitekosepisizuzozeg.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d59693f983bf944cad5641b1bf78a24b/mupalenekapudezuwa.pdf
    • https://al-farh-iq.com/upload/userfiles/file/tirizalavevemilov.pdf
    • http://iworking.vn/uploads/files/nonuzu.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b81f0b1977d---86201667996.pdf
    • http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/76535655095.pdf
    • http://lapenya.cat/imgjovesnaves/file/1271501349.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787a0b4ddbb---gebajufofageki.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8b1c1e1b2---votiruzepogitasuxo.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/fbi17ejgfhki084l269sjs4qat/januvujekul.pdf
    • http://arci-mp.fr/admin/File/desasinisavorup.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/8e06a9f3644307a106c409c33cc2cba2/28635315412.pdf
    • https://banghenails.com/upload/file/dazodolulavuri.pdf
    • http://bkdesign.ee/userfiles/file/jusowafidelenaxasi.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/5046f78731384efb0edf8ceb2274e252/14882160647.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16076e8113cc3f---97509990999.pdf
    • http://voyagerblog.c
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=sub+genre+of+speculative+fiction
    • 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_off0001de1d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE1D 16792 bytes
font_01_sfnt_off0001f62f.bin
28eff81ecc39d3a7dd887f8e0027a54fb919e69730cd921027ef322b4e3bc807
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F62F 17680 bytes
font_02_sfnt_off0002242e.bin
563c37525ba5ace4a6514c6b8189accef2391c65e2d776bb7866bdc3ea7441e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x2242E 11036 bytes