Malicious PDF — malware analysis report

Static analysis result for SHA-256 a693fef3c27b7716…

MALICIOUS

PDF

90.5 KB Created: 2021-09-05 02:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae4f97f00ab88a928817ca3f2ab3320c SHA-1: 7f859fd17f901c17dda53e505d4b267262618387 SHA-256: a693fef3c27b77165a0180c45a294c523b85a31b86f7c0375f692bda1a4feacd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised upload storage or disposable hosting. These elements suggest the PDF is intended to redirect users to malicious sites, likely for phishing or further malware delivery. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://akanaymatbaa.com/calisma2/files/uploads/84014546598.pdf
    • http://leadershipcareer.kr/fckeditor/_upload/file/tigulatimamanovuxa.pdf
    • http://sassyissy.com/survey/userfiles/files/bumuduke.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/6adb646fa4171c74815e6f8ffcc50735/bedukemoperavapire.pdf
    • https://muratay.nl/userfiles/file/96173110141.pdf
    • http://chixue.com/uploadfile/file/20210601111855.pdf
    • https://karinbentum.nl/uploads/file/bulaputukapej.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/960d8dc2b403aa009774fff44b93df1f/61164446693.pdf
    • http://bjsddesign.com/filespath/files/20210813230652.pdf
    • https://cubic.is/userfiles/file/15404221132.pdf
    • http://andrewsexes.org/clients/867461/File/59962786432.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740df61d16b---korifelowenikosapogixavug.pdf
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/sitevimabaleramalomepena.pdf
    • http://sk-massimo.com/js/upload/files/49530205303.pdf
    • https://burgaseguros.com/userfiles/file/65033113493.pdf
    • http://sentralperdana.com/file/jerojisufametudazi.pdf
    • https://harrisitalia.it/uploads/file/3132832568.pdf
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/wobuvigomuburaloderexared.pdf
    • http://gzcil.com/uploadfile/files/gobezipivorerapasijeba.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c72f392f6---44443990822.pdf
    • https://music-group-store.com/upload/files/xoruvutopelewapiref.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/44a29e66fbe174264483d3dde3e75c0b/93535439772.pdf
    • http://premo.at/userfiles/file/bekazaxegudilez.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=audio+medium+of+communication+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_off0000f7f6.bin
38664fd206c96cdbb713fc0d819e0cc6eb24fde8eed160fd27d71ccc82dc0922
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F6 19984 bytes
font_01_sfnt_off00012bff.bin
3ca2241782f84854bdde702c2cc5fc1d0153120c0144460aef6eae0e3dbbf8ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFF 10548 bytes
font_02_sfnt_off0001440a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1440A 16792 bytes