Malicious PDF — malware analysis report

Static analysis result for SHA-256 159df84a95841ce3…

MALICIOUS

PDF

84.5 KB Created: 2021-09-04 03:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b27f52e2cdbecc27bf9ac749c02cd0bf SHA-1: 0ba0293a19a65d99690ce41bf475e35286e58d7d SHA-256: 159df84a95841ce35a4de67451f31396b85385e731db704c0698a889797c1008
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm with numerous external URIs, many hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=oops+interview+questions+pdf PDF link annotation
    • http://rs-entp.com/upload/file/womabifimebaxupajiwodix.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/69584606416.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/derebew.pdfIn PDF document text
    • http://acril.ru/ufiles/files/59225771764.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/a1aabefa4ec63097c7e9028422c1e3f2/gidimewo.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67537144996.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/vojegekuseso.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/b4322a1fafc10f9bef7096daa91cb9cb/35205305668.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/pidum.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087677f7b16e---zonopajinugasi.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/kamesifi.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ba39eac28bb---vonudataw.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/wadajaderebepi.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/979bd94070b2efd17fe70dab39680c32/wirakozixefumi.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/butizebawoxarati.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/c815f26d1bdff539cba50fde80dcb06d/fozovowevizirirometabeji.pdfIn PDF document text
    • https://csn-alliance.com/data/files/kepopoz.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/xinanituke.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612810176577c---97630189578.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/ranimesu.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb18e2f05c---35434028704.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/74715212500.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609600df88dc9---67974804806.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_off0000e609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE609 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE20 10704 bytes
SHA-256: 0ae553d0e8231c4ecc5b5d478ee595705ca2c60cccad802fa0d64dc8d9b4134f
font_02_sfnt_off000116a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A7 17900 bytes
SHA-256: 7193dc1a4b2560b46551bfdef1becdfac20d3b24892b197db3e89722f8c94dfa

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