Malicious PDF — malware analysis report

Static analysis result for SHA-256 545950ea22277099…

MALICIOUS

PDF

89.2 KB Created: 2021-07-27 15:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2130c624e5a5866460d6dddc0ef153f SHA-1: 9e76ea79e52b0d79a6f8a6069e6978661b0d44b9 SHA-256: 545950ea22277099b01fb941d4b872ab3c689345127418855581f53d43b33a3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm. Multiple heuristics indicate the document points to compromised CMS uploads and disposable hosting domains, suggesting an intent to lure users to malicious sites. The presence of numerous URLs, many hosted on potentially compromised WordPress sites, reinforces this phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://snqrsl.quebec/upload/editor/file/kinabotefesodavo.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/9f322020520c6be4a63ead9ca610d385/libetupebepilumevalaz.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a6c37373b---63192592460.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703299a1397---53367394621.pdf
    • http://aihyang.com/userfiles/file/kosakarewusudip.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a215dc97ac3---lesapofonenuki.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1be89e31c---90943671678.pdf
    • https://baobihungphu.com/media/ftp/file/67114712226.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cf4023ed0---90657615922.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac82ed6e8bf---90456813320.pdf
    • http://gagutp.com/sa_upload/userfiles/file/20210513204546.pdf
    • https://iiml-pgpsm.in/ckfinder/uploads/userfiles/files/roxadalojizovojosowemil.pdf
    • https://fundreamz.com/ckfinder/userfiles/files/56687450129.pdf
    • http://marsalanoleggio.it/userfiles/files/bolimenivosasanigagujur.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/hpn1s6egfrch500kvcimeelrqa/dazobilutiwinu.pdf
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/de8d7ed4c93ded919f487c3753fe1732/sukijuxax.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b627c8338---resavona.pdf
    • http://dalnoboy.org/data/filestorage/upload/files/90956641214.pdf
    • http://otevrel.eu/ckfinder/userfiles/files/61999889477.pdf
    • http://chono.mn/uploads/userfiles/files/magoladibawasirumumixa.pdf
    • https://alyosserspneed.com/userfiles/files/zulabevika.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160806206c3d7d---kabebapuzi.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/bdb04513954e04f6c04460c292de5098/44780634616.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=what+is+the+code+for+tag+with+ryan+food+truck
    • 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_off0000f4f9.bin
d1926a00351d7a3fe582d57aede96bbca5bc4e913d9375cd6cb4eb5a5b9244b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F9 17344 bytes
font_01_sfnt_off00012219.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12219 16792 bytes
font_02_sfnt_off00013a30.bin
1db61cdb0856f7f189f9f53511241075e868aa5d66e79f5a30725c7eeb4999ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A30 11096 bytes