Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d9681dd3ff60c4…

MALICIOUS

PDF

69.9 KB Created: 2021-09-11 22:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39ddc23c7810adaaae32f2ca9b917209 SHA-1: f5204493bc71548043d991cb81128f22389d61fd SHA-256: 19d9681dd3ff60c4e1f374621f6bd96a1fe0c16d7491c49e26672190fc8ea0e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://aimecostruzioni.it/userfiles/files/21659901462.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/70715819962.pdf
    • https://damiel.eu/userfiles/file/regedakafanavozizureruz.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/d3270ab3fd66fcb174eabe2187095770/85049075107.pdf
    • http://kirakuramen.com/uploads/files/winuraweguverogikogerozoz.pdf
    • https://franciscojaviermoreno.com/DocsCKeditor/files/51546807791.pdf
    • http://www.bsa.by/ckfinder/userfiles/files/35200720443.pdf
    • http://faisaltowel.com/survey/userfiles/files/94708008138.pdf
    • http://michardardillier.com/ckfinder/userfiles/files/99754482345.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308ca5ac22c---latevuzalepunix.pdf
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lalosifup.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332d8d8c1df---magifup.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c59296dcf---8626216629.pdf
    • http://wajl.net/img/file/202198115658.pdf
    • http://budoprojekt.eu/obrazy/file/70863242422.pdf
    • http://missteenqueenuk.com/userfiles/file/sasagokixamoneze.pdf
    • http://18554080.com/userfiles/file/63118211763.pdf
    • http://www.sictombbi.fr/ckfinder/userfiles/files/sogegapugajimiloxokog.pdf
    • http://longarmacademy.net/fckeditor/userfiles/file/pakadipiwaravexukapano.pdf
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/38076576567.pdf
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/wipiwuwivopaf.pdf
    • http://dlevitin.ru/fck_editor_files/files/kikowe.pdf
    • http://autowagon.it/userfiles/files/jatuzaposejudagagamekumek.pdf
    • http://ecoaga.com/documentos/file/56783239834.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=download+ed+sheeran+ft+justin+bieber
    • 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_off0000b1f7.bin
f74eb0c10da9e0bdab42aa1a919d7657472ac7e482e57ed2b78d853749e4754e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F7 15292 bytes
font_01_sfnt_off0000d90e.bin
50f23f541483db6d9f2613b543bf96ad4c3deb1b7c32f6315a0f687c5cadd32d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD90E 10908 bytes
font_02_sfnt_off0000f23e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 16792 bytes