Malicious PDF — malware analysis report

Static analysis result for SHA-256 efba6598588dbdfa…

MALICIOUS

PDF

87.7 KB Created: 2021-07-20 03:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0357afaa2ff1a7b373d612695063304d SHA-1: 7b10536e10c0b3faeb05807485e329da29fd4feb SHA-256: efba6598588dbdfa99c75ef9503a341b887a0127f4b354b554c23632f86f1207
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The presence of multiple distinct hosts and the use of disposable hosting further indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/d4de668b089444a548d4150e875c5bc4/91446303379.pdf
    • https://mangonebike.com/uploads/file/rilinisijiporoxowoka.pdf
    • https://prosaison.fr/userfiles/files/pagegipakafa.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3c35e02b32a166dcfaecc31bd0ab1cd8/47897457476.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/f941de91fc9e4ebd9c99c439b911f960/xemabazizerexuzotad.pdf
    • http://globalroomplus.com/bot/ckfinder/uf/files/42352785179.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3507afa48---golarikanolosibojoju.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076299da2938---fifuwajoloxinevonuguk.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160944df9c5c2e---fakem.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796d863a563---vixoba.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/4789b16678c9d5f7b9fd9055284caa97/3097763020.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc259940e8b---34283523269.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/82978d9b61756c1ddd565f6bbed22218/76121255506.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/7ae91c507cafa0ff9f7467ee3fd409a7/babimulikelaroj.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/vgdanuk319k5uescc4uag6gal8/30452648003.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/54d8962cb4dfde2a79748dc0eea990d3/10264299254.pdf
    • http://x04ydivan.ru/userfiles/file/98739040833.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/5abd245fcc564f406956e471eddec06c/zabuwosidogogatufe.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/1234afc04e36e35ba3b445559a5c8eb4/wikanapufovako.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f2de3b40b---73206462691.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/7b87755080c1ecb18b2569e41c601a27/85367254847.pdf
    • http://boschvietnam.vn/files/usersfiles/files/mumomuwubivelugiv.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/ugm5m75i31lal8ecqsdg10jnb1/kotomukuzodase.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=let%27s+settle+this+once+and+for+all
    • 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_off0000e50f.bin
309e3c3a37fa9d5db3a157f73098b61f75d6dcd9de62878463d70e7b7a08ba0e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE50F 10564 bytes
font_01_sfnt_off0000fd1d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1D 16792 bytes
font_02_sfnt_off0001152f.bin
d4e43f8770df2c644d7a5a25f7fd5d09f1df4d6300a51b6323ca77d0da2c06da
pdf-font-stream PDF embedded font (sfnt) at offset 0x1152F 23796 bytes