Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ab4c46396bd883…

MALICIOUS

PDF

92.5 KB Created: 2021-07-15 12:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: ae27fc28757aabcb6b4b50c0cfb27a4e SHA-1: 459f36dcfc388559b25bc17a9f99091885ec7e60 SHA-256: 99ab4c46396bd883b19bb9e02148ae7deb0492de907c2c5bc1cd323dc777219a
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly supports a malicious verdict. The document body is unreadable, but the heuristics and URLs suggest a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 5

  • 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://pistant.ru/uplcv?utm_term=chemical+eric+dealing+with+the+disintegration+of+central+control+answers PDF link annotation
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f184c4a6a9---xigolebilanil.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/tuxuxodamepejivaroxeto.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/67461724012.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/kojazuxufejoxulemav.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/37694404635.pdfIn PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/16124407853.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2acb06de11---66771881571.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/74a111d2f7cc3ec213fb0966887fb038/68049046440.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/fb34fa73ea930b8fe91c456eeb5ca33b/96401854219.pdfIn PDF document text
    • http://hpc1970reunion.com/clients/3/3e/3eb4c5728feca7eb79feed4eed44c519/File/14590474117.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160efeb086f309---kugijojemowuxavojomew.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/701nk5p8dh7pp23mp6h8l5n0j2/62462588210.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb0b4a88cb---zawarokozeraz.pdfIn PDF document text
    • http://lyshiying.com/d/files/40553001702.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/bezukogotusibozumabobiwo.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/patabagepepir.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/rinosetomavateruzon.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/nobogepatelifijabok.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/jixemin.pdfIn PDF document text
    • https://cmoretv.com/userfiles/ziginikena.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/5795d6698db63afa9f2740236e51ad24/28842740290.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/87170794439.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a87e751562a---67927399630.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/66212995709.pdfIn PDF document text
    • http://artside.org/data/temp/file/baruligubun.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/dojiledupazinojinosepire.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/de08313219b57ae06aeef79390505622/tikivirulepu.pdfIn PDF document text
    • 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_off00010296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAD 11040 bytes
SHA-256: e413d1e0a9ae107a19b49d84b561ba21f4f359d4500ce029808015cd6bace713
font_02_sfnt_off0001340a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340A 18684 bytes
SHA-256: 8ccb3f738e6246231b3e49d47e7f87d8e62330b3ea690249dea738f6991d0897