Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef921ffbc377be2…

MALICIOUS

PDF

75.0 KB Created: 2021-08-17 14:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 655a0850241cec63fa854ee82aabc4f8 SHA-1: ebdb68eef70dcb11b98263dd5ae62c07ae0ebab8 SHA-256: 8ef921ffbc377be2b0758b6b1c3f0202e76fe329609f688070eedd9a9140dcfe
156 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs pointing to compromised or disposable hosting domains, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://pistant.ru/uplcv?utm_term=states+of+matter+foldable+pdf PDF link annotation
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/0da4e977cd10b61924027575ac0f04b0/vozunepoxuxuworilu.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/venisixowipi.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/74385570927.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b0f081ed5---koremonipakobi.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/6fce8d41c61ec1872ec045f0247ba7cf/3951976262.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/kivijifafawopomipodi.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/rijimurubivarido.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/75594047306.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/j1rju274a9ld1gop15u2hnu6k9/10731256272.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/158b47be0f9f7db9543e854018e222d7/pukadesasunud.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/97760785560.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/15179005813.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/df69c3b779022b6bc5a8a66b7f8b0cbf/90189094450.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ac7b29d2c---46661512148.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/ahvqqfhch9ntbvjr09o65urttn/getanoxe.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a286bc9a121---sidewu.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/jakosekorefipenowukijek.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/vuxiwalejoju.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/fujewotejisukiwigal.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/5527329266.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160b56b90eb9f2---42116884368.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/vibunitupexosi.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/c5f0bc466cae2686f240a19431109860/pagoselasasomuvovepu.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_off0000c45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC45D 10676 bytes
SHA-256: 72136bc2c3f46dc5b44d737066fe95b833eb5258a616d848c758c7078f8ca961
font_01_sfnt_off0000dc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC97 15764 bytes
SHA-256: bbcdf6b56c6d7ff397d77a1d2d05c9003054f45270471ab9d6aa553380674a2d
font_02_sfnt_off000104dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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