Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b8a23f0d4b3fd7…

MALICIOUS

PDF

79.3 KB Created: 2021-09-02 00:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e21ec6f101cd64e217d52aa60304d20 SHA-1: b4aa3d3065cf436d6649caeb59677f11f5a9cb7c SHA-256: 44b8a23f0d4b3fd7aaecede3fd5513cc551a53c2c51b5f898a971d781d398479
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/d1dbebcae8f69f894c2508381159c91e/dugomu.pdf
    • http://qytbearing.com/upfile/file/ditotila.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/373af2c788c02b2153dc106e1b8714a4/wogaziripodu.pdf
    • https://asiarsolutions.com/userfiles/file/melaninowofu.pdf
    • http://prestinoequitacion.com/imagenes/upload/files/74826707016.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fde54d9cd3---vegopesugof.pdf
    • https://www.andreivieru.com/ckfinder/userfiles/files/nuzizodosajusat.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/e21bf51455e9d007c0cc3aeae31d083b/83944044231.pdf
    • http://hocikto.info/userfiles/file/kusefar.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/a9cc70d5aaae20519163a6e2d023881c/mopazenavifemopebo.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb03bae5777---56454075120.pdf
    • http://regimhotelierbucuresti.com/images/userfiles/suponotalopidojefumad.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/64facdd5a50dad619224c1e5d4e243b6/70892509386.pdf
    • http://kolbiko.com/images/uploads/file/51251917046.pdf
    • http://gibisch.com/files/files/fodizebino.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929cfbd2aaa---zezukipazikowixinaxaxax.pdf
    • https://smartech.lv/sites/smartech/uploads/documents/files/28728374547.pdf
    • https://kawanmto.com/contents//files/67593800493.pdf
    • http://www.la-rocca.pl/app/webroot/files/files/favuzipobaranubopuxizagox.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/41c81ecb728ba8508639ea3149a24564/23277444156.pdf
    • http://lsneotek.com/ckupload/files/56352109601.pdf
    • http://sportschoolindex.nl/images/uploads/tabazuwuf.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa0ab42835---nedizo.pdf
    • https://asset-books.com/userfiles/file/jukobupikibelapiditilotom.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ict+forex+trading+strategy
    • 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_off0000ce9f.bin
69ca9feba015091a633938b53a98bf884510a040279be1469eb114bfad746c1c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9F 10772 bytes
font_01_sfnt_off0000e764.bin
cb7c4444c535654e43b1ebd9059103a660f0961c186af9fd813c79432fc2ef6d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE764 18956 bytes
font_02_sfnt_off0001171c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1171C 16792 bytes