Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a83e7a68ec2e79f…

MALICIOUS

PDF

89.4 KB Created: 2021-09-23 08:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ea8fae62f6f1925d9d57e521e4dfcf25 SHA-1: 182bde03a4a33caf7558181f7ec359527eba02ea SHA-256: 2a83e7a68ec2e79f3593f9114580197565d4a9a6211ed5c9fdf29e58394842a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://pansky.ru/UserFiles/File/65756604344.pdf In PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/58748903068.pdfIn PDF document text
    • http://bulmarconsult.com/files/35419322818.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/86402579196.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/pufuvobapogoxijowavexe.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/72168752410.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/zulatodubajuzomex.pdfIn PDF document text
    • http://www.siposferenc.hu/html/kagomugewof.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161470fddc8eba---nakapasobip.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ve7b24ppqchqgm9pcr5cnq8m7s/33728924416.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/mamefomuda.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/rijebijosoxoruvevusopegi.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613986ccbe015---situnobumurebogudikupi.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/laxovokefe.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/62039959151.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210922172222.pdfIn PDF document text
    • http://falconltd.pl/cache/file/mejutedefivikakebevudub.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/32902710161.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/071046486468.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/zovonomunamabokizojopadim.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/wolanuzeno.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/54804682995.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/24710203371.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/robaxevoxoxeba.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/jufuvisedosopozema.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/fe0a8518f0d0743f8232459cfd5c5023/limamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=watch+movies+online+for+free+2020PDF 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_off0000f9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BF 10900 bytes
SHA-256: 30b1903d59e735a39b7b659c7c43447e5c83d36a4464d5f1ee81a843f2079f4f
font_01_sfnt_off000112e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF7 17596 bytes
SHA-256: d0b72d02a172a23fb44e489f55f35f0fa32a8f5464101e48124214290209bb19

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