Malicious PDF — malware analysis report

Static analysis result for SHA-256 12e76d5c9751f287…

MALICIOUS

PDF

82.0 KB Created: 2021-09-21 00:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7973ff47b6c9d548f52c47e75d0e6d41 SHA-1: 9a77f88baba778d63ac57fd71a2440dc86023ee7 SHA-256: 12e76d5c9751f287ab6ca9f5cc61f6febbcdd2a466ff2e596648682448314306
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, some hosted on compromised CMS platforms. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a tactic to manipulate search engine rankings or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://tatagz.com/uploadfile/files/85575277056.pdf In PDF document text
    • https://adurucui.com/ckfinder/files/fitanetorizapuwitus.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7a478503d---vokemokuxotajekamazaj.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/19426805095.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/88762574390.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/41908069285.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/25693091805.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/37294637447.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/29274612029.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/xanodijivikoluli.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/sixenolagumodovanivubo.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/nikixijofolofoda.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/22999825294.pdfIn PDF document text
    • https://salonrewards.ca/images/file/90145184149.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vopalijonewubumugezag.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/8467515298.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/8d2d136058582c08e9ec25e57cab759b/kavuxemimab.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/21968453136.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/ximovajutoruw.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/76593681118.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/50505332888.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/vosirosikobisoluz.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/31041964722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ielts+writing+task+2+samples+band+7+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDB 15792 bytes
SHA-256: 5f9fd2db5afe51c70a59de76aad473c937b2b60e191961fec495f0a1a13af836
font_01_sfnt_off0001085e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12075 11160 bytes
SHA-256: 57341cc56a54c02d711f1b3dc0d3fc6ab480eefd3c47a2d573ba32d1a2166530