Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9ab8c968388bd8…

MALICIOUS

PDF

76.9 KB Created: 2021-09-08 05:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5b88960030d0d7d226f98bb601396acb SHA-1: 823714d59b4a1d9fac403af617b4b83517089572 SHA-256: df9ab8c968388bd85a67f1bb9698131f39ee77271e338bf35b70d9076538f6d9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to potentially compromised WordPress upload directories. These links likely serve as a lure to redirect users to malicious sites, a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dac0b7af7ff---31773864834.pdf In PDF document text
    • http://automozg.by/upload/editor/files/79362724876.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/siburubaporajajeji.pdfIn PDF document text
    • http://poliinc.com/upload/files/45627341623.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/fotexakoxiwadasomo.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/1627214825.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/gidijametetosikeminawaxa.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/biligenisinozanexigekamek.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/nusvgnmf9e2l1p1oj6m4fg72c5/47537714625.pdfIn PDF document text
    • http://emyorganizasyon.com/emy/ckfinder/userfiles/files/87405753482.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/deaa04064e6d7093c5a6537589aeaeab/37615437190.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/20708842933.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160911ebe68b26---pukebivaraputosapufebijo.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/caf3da4af50dae01f02986efa3e05d73/50434061873.pdfIn PDF document text
    • http://minerva-collection.net/files/files/60480147660.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/22706422033.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/55976898092.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160826043dd49b---jojumipoz.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/c371404ac532a398e7de90992c3cad61/japikumupemala.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/wukesovonug.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/50198361359.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-8-1/20210801102305313619.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/doxowufajudaxugugoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=jeep+cherokee+sport+1999+owners+manualPDF 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_off0000ca17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA17 11036 bytes
SHA-256: f653a1f3959c9d65ffb367dd23e94819311e03b47b83a8a8ed56ff9ae868982c
font_01_sfnt_off0000e3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C8 16432 bytes
SHA-256: 69003990ec889deb9a8b2f9a4d3f6d3d22ee32da4fb2d8d5c567d6ecda836632
font_02_sfnt_off00010e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1