Malicious PDF — malware analysis report

Static analysis result for SHA-256 be79ea1e7a54e323…

MALICIOUS

PDF

69.0 KB Created: 2021-09-13 06:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efb2e50f53f8ed52212c4d65849bf50f SHA-1: a01cf96d649e5b1062c74f7430b62f556cc2b8ea SHA-256: be79ea1e7a54e323d5bae18c5428691653b0f905d13d35eba1d5cf81562f1606
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-only lure, a common phishing tactic to obscure clickable elements. It contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339ac149a9d---96273939833.pdf
    • http://www.eatvirukai.lt/uploads/files/wiviwasubaraxevuwuxi.pdf
    • http://oticonshop.com/ckfinder/userfiles/files/nugiwuvonutemosukaxiki.pdf
    • http://bookblog.kr/data/file/files/jalinolorakenil.pdf
    • http://www.jindatunnel.com/up_files/file/betomesawo.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/xitafijuwurivoxelo.pdf
    • https://shopinhome.com/ci/userfiles/files/1011841755.pdf
    • http://physio-praxismitte.de/userfiles/joxemajowopamivafupebu.pdf
    • http://eldorautomaticgates.com/UserFiles/file/sanogawimafigulelolo.pdf
    • https://tybistanbul.org/resimler/files/felebewubolu.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/vmmjsut4qlrtftt91qq0s4otsl/98687458150.pdf
    • http://thevisionkharj.com/userfiles/files/43529589594.pdf
    • http://buyyoutubelikes.com/ci/userfiles/files/demowepan.pdf
    • http://www.naturhalles.fr/fckeditor/userfiles/file/6565131404.pdf
    • http://demenagements-remond.fr/userfiles/file/20210911235247.pdf
    • http://chataphan.com/file_media/file_image/file/livukelunufavaj.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16135dc65ddc25---vunilima.pdf
    • https://zakarpattya-tour.com/upload/14160602835.pdf
    • https://ofly.om-digitalsolutions.cn/upload/files/bepapamaribobadepa.pdf
    • http://medicalproduct.hu/images/files/pejexu.pdf
    • http://chinahongji.com/d/files/nadejiwegid.pdf
    • http://csc0512.com/userfiles/file/20210903235722_w0iw0a.pdf
    • https://deesudcoolingtower.com/userfiles/file/73498844919.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=fruit+ninja+5th+anniversary+apk
    • 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_off0000b252.bin
ee7be93318f6dbd543beebe79e3b9e6febb34871575448423b14d7bbfa6152a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xB252 14204 bytes
font_01_sfnt_off0000d551.bin
e31b95fb995ccf9a762061b62f9a23fdf2115695ba0471a44415e14f195db76e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD551 10796 bytes
font_02_sfnt_off0000ee2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2D 16792 bytes