Malicious PDF — malware analysis report

Static analysis result for SHA-256 016136ca9ba42531…

MALICIOUS

PDF

81.5 KB Created: 2021-09-21 04:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b12d8d1cc0489f85823a3c7abe7efb8 SHA-1: 0b0d04d5fc19489c66bd86f6ba160daaed7aa6e8 SHA-256: 016136ca9ba42531442a0b9ddccf391b5b95779fe19ae1c525366e61e751e323
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable domains, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://solucionaesp.com/ckfinder/userfiles/files/dedidagup.pdf
    • https://pacpartner.net/images_client/imagesfile/fubezewopek.pdf
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/78062658933.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480cdb20c0f---sukapapepen.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161322edb85905---69606416529.pdf
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/tatosato.pdf
    • http://dienlanhlongan.com/upload/files/3257865258.pdf
    • http://citygclub.com/ckupload/files/dejibonevubirunis.pdf
    • http://werkschoenenverkoop.nl/images/docman/files/71201063592.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16141f515f16d6---71453720.pdf
    • http://gongotour.com/FileData/ckfinder/files/20210921_0AB843E3B410C31C.pdf
    • http://eca.or.th/ckfinder/userfiles/files/xoxesu.pdf
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/gigobofaratuwuv.pdf
    • https://icoachyou.biz/images/ckeditor/files/65636725521.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/90b74b08a7dd7f1e535dfe1787eed12d/tufosuroxidesude.pdf
    • http://studiorinaldibedin.eu/userfiles/files/84158069273.pdf
    • http://juncheng.tw/upload/files/42294116756.pdf
    • http://architettoseneca.com/userfiles/files/37371941492.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba7b6f3739---32594760753.pdf
    • http://screen.by/images/file/xejor.pdf
    • https://gbagencement.fr/uploads/file/73081653932.pdf
    • http://villalapinetafavignana.it/userfiles/files/90407490082.pdf
    • https://budgetparking.ca/admin/uploads/file/36017317211.pdf
    • http://xy-interior.com/uploads/files/202109151433146741.pdf
    • https://gentrilieu.vn/userfiles/file/larudinaran.pdf
    • https://www.ftha.org/admin/ckfinder/userfiles/files/87491336824.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=mx+player+apk+for+android+tv
    • 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_off0000d73a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD73A 16792 bytes
font_01_sfnt_off0000ef4c.bin
a5af9eeade48378e60081f5578b5b2784cd7ac46d6c9705c41ebc396cdd0d8ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4C 18616 bytes
font_02_sfnt_off00012011.bin
5a643b1a1c1ed9031d73e4b98815518a0a68901b9d50cbc850feccbf47736eec
pdf-font-stream PDF embedded font (sfnt) at offset 0x12011 10692 bytes