Malicious PDF — malware analysis report

Static analysis result for SHA-256 836da11ecd27dc43…

MALICIOUS

PDF

71.6 KB Created: 2021-08-27 23:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 548688ac9fc325f45208e4d76684c806 SHA-1: 40c4b0ca5a30a2393236c871130ab0a9432f252c SHA-256: 836da11ecd27dc4387efe59b138f9ce09aaa8f73e7cf749d72be2c0cd38f9ee2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The embedded URLs and the PDF structure suggest an attempt to exploit users by presenting a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815d836c093---pepugokikafejebosenuzom.pdf In PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/10547663113.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/59380410633.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/lonavijenukasufeka.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b11ad93fef---jabilurofigubamado.pdfIn PDF document text
    • http://concept-art.nl/app/webroot/files/userfiles/files/goduwid.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969846b40cf---labotave.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/51973159965.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/5a505ceaa19d535d3ba50798a671bb70/92917189445.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c100936075a---2579077348.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/31620146422.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/60543293109.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/79821721960.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/21043589651.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/gajeduxerila.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/41346460177.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/4686338622.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/24574020537.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/vebiwarubop.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/70160757670.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/c139jp2t8pfbptjkksi4rtalk1/28005824262.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b17221627b7---51349716106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=n+to+m3PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12F 9612 bytes
SHA-256: 76eca3af6b1d110eb44fc76b1b11188009f58c4e1b1c75369617988715a909e9
font_02_sfnt_off0000e60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60D 16928 bytes
SHA-256: fc9fee25f3d7a1316507d387924b35dc0b696c187ac055c8c787ef8f4ddd5dd3

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