Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6327226a04dc646…

MALICIOUS

PDF

71.8 KB Created: 2021-09-03 14:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 905f3a451382fede8630dcf038ab2a61 SHA-1: c0d03969130047c4788d9e76cff85191eb6ccceb SHA-256: a6327226a04dc646cbdae06d2096eb1796708b1d1202882186f9f0dc560299a5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains that appear to be compromised or are used for link farming. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of distributing links through potentially malicious or compromised websites. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://smolninskayahotel.com/userfiles/file/zumuvugonava.pdf In PDF document text
    • http://jp-cable.com/d/files/vuxufukenisogujinok.pdfIn PDF document text
    • http://julianina.de/upload/file/39144609446.pdfIn PDF document text
    • https://mojer.bg/files/30927473742.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/biwimizepasusuzikusosufo.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16086961667de8---4426923501.pdfIn PDF document text
    • http://xpress2.eu/ckfinder/userfiles/files/63148231958.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/210243316799.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/95095725409.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/4mkafme0st1ps0iaajppsjjtic/bejewopifigad.pdfIn PDF document text
    • https://polandpools.com/contents//files/27795526045.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/e97bd52ab6d687036679a333ffa56c45/damozosiwurolega.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304cb697d93---sufav.pdfIn PDF document text
    • http://skia22.ru/pic/file/mitaweku.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/51695897252.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/79557757810.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/52249893935.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/33714421147.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/zijidawaxajeguwabox.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/dafasusa.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/83063986721.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/5643490920.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/b56dc770da8bad65606d579f2e432302/zobazeroweg.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/u6k6509jfmugln0nrb72tg7cn0/84073017872.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/75632e0e4b9877ac3502290f6b75061d/semikuvezo.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/25759423982.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=shoulder+workout+plan+with+pictures+pdfPDF 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_off0000b89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB89C 15460 bytes
SHA-256: c1beeeb3bebb270234c335d43f34298719720af47a683e83e9a45128a6732735
font_01_sfnt_off0000def4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70B 11072 bytes
SHA-256: f822b887ebd40d7cbf001aa2fc310a94ab01d4a6019b4d521fc24612b88a2612