Malicious PDF — malware analysis report

Static analysis result for SHA-256 c49feb9c8072a6c1…

MALICIOUS

PDF

101.8 KB Created: 2021-08-02 09:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 23963973b23c5b43d8066b2cb43fd4d9 SHA-1: e1b72b444934e5eb3fa98be2f3862ba4b2dd49dc SHA-256: c49feb9c8072a6c1a0d48d09fa8578c6520f7f703f6cdc4835236fac44cedcab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to obscure malicious destinations. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of external URIs and link farms suggests an attempt to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://umrllc.com/userfiles/files/37058316842.pdf In PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/9b9397cb651931d119b525c18ebac542/58617704297.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/badodesinaj.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/lejej.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/78301094618.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/kegot.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/99449cb4fad567d1910471320f3e2a9f/xapujukukivatikuvuwu.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bdc96046f---zugokakusikir.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/4mf9sehnoocvm06ptqoadlmgan/fetefaw.pdfIn PDF document text
    • https://isosklo.cz/uploads/78807735923.pdfIn PDF document text
    • https://2acontractor.it/images/file/loberifiwut.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607474a102bbc---87551726131.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/067878d1597954b4d235ee0d4ea95486/24500993357.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1dd35493e---terafogoxu.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/f3462e52dcd1d771ba02120b7ad30cb5/loratirakopafuvix.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160943f9dd26a4---13839131929.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/94008271924.pdfIn PDF document text
    • http://logansport1971.com/clients/4/42/424235dfd0fdcd2d3cc2afd1e16bb83e/File/varumisateniwivasotib.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/58566371493.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/lezixoxupowo.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/rumubozuwutopag.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/tepasexapekol.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/ce58190ae3176660c0dcc570e158a36f/47044497924.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/25595872405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=sql+complete+guide+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11519 10752 bytes
SHA-256: c34906df034cd4257b7ab66f3b6736eded6eefe2495df1cc0f88b5ed33b0edbc
font_01_sfnt_off00012d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14568 17484 bytes
SHA-256: c65b1251bd66f05f5d6b856f47d02874a087b81e4b980795044f52d2c1753fb7
font_03_sfnt_off0001731d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1731D 16252 bytes
SHA-256: 6d568972154aa9e6553788066da68fe6d5b0b58db67a92e881fdc4c3770f4e1b