Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb72ea0006d507c…

MALICIOUS

PDF

88.2 KB Created: 2021-09-05 17:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d2cea2a015f3ce1badd1fb8eb786b75 SHA-1: a5c5039374f33aa7dea99e2012c28878633f7362 SHA-256: 8cb72ea0006d507cf9b97897e48f166ffa72e9f810867d1630253a614de8e153
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many hosted on compromised websites, suggesting a phishing or content-luring campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to download further payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=bmw+1+series+owners+manual+pdf+download
    • http://agro-pasz.pl/ckfinder/userfiles/files/59487525698.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/7gh1sbpjpacfb1au3od1tnv59q/wotedikugavozoreja.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2967228cee---55019675680.pdf
    • https://iword.de/userfiles/file/10137120714.pdf
    • http://inventory-acepipe.com/images/uploads/files/93600758679.pdf
    • http://zbraneklapka.cz/ckfinder/userfiles/files/gekevorugi.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/c42d8371d9c39d45cce52dbb77764503/lutavigirugakupa.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/xomugorejivage.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/56934cc6368ffabee211004f908a1d9d/sederixagukegikuzamub.pdf
    • http://parkety-patemal.sk/files/file/77647769219.pdf
    • http://foodchemsino.com/d/files/10709286474.pdf
    • https://ancoraeducacion.com/images/25267102335.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160da0d029c124---65860597846.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e902694ae5---rivodowewa.pdf
    • http://jfe.hk/userfiles/zulip.pdf
    • http://arunimaflavours.com/userfiles/file/nuvewotagarozega.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099314083420---26347710998.pdf
    • https://silky.ae/images/bulk_images/files/49816395979.pdf
    • http://studioriggio.it/userfiles/files/74120798793.pdf
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/86623257195.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21d27d82fa---ruliwegonowekenabalogudel.pdf
    • http://daieimotors.com/js/upload/files/logasujuxu.pdf
    • https://funke.be/data/file/89994716173.pdf
    • http://sklepjola.pl/userfiles/file/fakoxiledazewulu.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd1fe8afb14---susupemubevavilodig.pdf
    • 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_off0000eed1.bin
fb376ccd74e98162d3698b1fb17d6951d30da2271820dd7e1a91be04a65bc485
pdf-font-stream PDF embedded font (sfnt) at offset 0xEED1 19484 bytes
font_01_sfnt_off0001218f.bin
8cdbdf5ed360b64643f832cfcb691388b7e74c8564fd69cd3f82bbe261eed016
pdf-font-stream PDF embedded font (sfnt) at offset 0x1218F 10852 bytes
font_02_sfnt_off00013aaf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAF 16792 bytes