Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a38aed44e7fa596…

MALICIOUS

PDF

74.3 KB Created: 2021-07-03 08:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8306c93ecb281aa2caec8253d142ae5 SHA-1: c4237f5126f992b8603f9aeef06582bffbbd309f SHA-256: 5a38aed44e7fa5969d10f42b9e09c64e762223db6678176888db15571031990f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to host malicious content, likely for phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=what+is+the+solution+of
    • http://www.hydro-tg.pro/upload/file/78909247540.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/71461635640.pdf
    • http://omgmediatank.com/userfiles/files/84281975631.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b23a72eb61---19637207762.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096bf2b7de1a---11207150052.pdf
    • http://asustainable.com/global/file/wedizifoxuxisemi.pdf
    • https://himalayanthailand.com/image/upload/File/77847065884.pdf
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/34940232969.pdf
    • http://circuitvietnamcambodge.com/hinhanh/file/xikikekowukojojerofum.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/e8c2ae8b71124cd57b24711fe70cddac/sigesejododorefiruviri.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/a7f96986eac17c25cf69c50f091eb62f/47403214798.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609771ff46c3a---29272805798.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/e1orur6kbg5f9f2tiklpr9to35/losawefowelejavorujevosi.pdf
    • http://saovietgroup.com/upload/FCK/file/22837129276.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd2327907a---dujinowilujawumogebi.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921c76163de---bekatixidilibeboga.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8091a3c6c---40921227064.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/8994cfa3d54cbe5a8c8e116dc91051ad/nopomukosetelakonabere.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/ca06cfd650b7ab4c6cacb71e73cc7753/3450965953.pdf
    • https://ewdel.cz/ckfinder/userfiles/files/pifegalosireb.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160720b0d53b9b---pewiwerumom.pdf
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/wonido.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609dca68eb577---tofapokovavemeza.pdf
    • http://www.pattyn360.com/upload/forum/files/40801507224.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_off0000c079.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC079 16792 bytes
font_01_sfnt_off0000d88b.bin
931c104eb5c46b255e6d88eed7dc2b453d5a60fcae5b1d941edfcafb6448bccf
pdf-font-stream PDF embedded font (sfnt) at offset 0xD88B 16544 bytes
font_02_sfnt_off00010351.bin
d0883c364ca4d3acce27703483f92bf9a5869b060ae23c4f1d4e40139b03ac0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10351 10304 bytes