Malicious PDF — malware analysis report

Static analysis result for SHA-256 9461a1ea1f850e8d…

MALICIOUS

PDF

86.6 KB Created: 2021-07-01 18:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: aeff93d4847f74ab6e8d9a3bc95eb4c8 SHA-1: 041b6bd4f1fca3fd19e008a94f9cfb22c45f6234 SHA-256: 9461a1ea1f850e8d87f839115f17adb455c144f4a799750df761c0ad6a111574
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to various websites. Several of these URLs are hosted on compromised WordPress upload directories, increasing the likelihood of malicious content delivery. The PDF's structure and the nature of the embedded links suggest an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://omonetach.pl/foto/ilustracje/file/kowel.pdf In PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7a0d051f---33952759434.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/88a3cee60bfb2f8307536efa1c5936a4/40189828678.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/66842302510.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608035f652bf1---79459841150.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/7027178234.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210613012104_hus8pf.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898be8d4087---15200305813.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/jotirorosemis.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/malifujomilelige.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/deaae623a5f1db53e91b026ae5c8bcd6/84888893028.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608021b4ec863---30321956542.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/zowovujijijujikapukunesi.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/97214721329.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/fcea1fd4019562fcacf3d0f3ddc97efa/90818697630.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8269510bc4---sidibujejikejuzuxumasotoj.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb43d91825---25326611342.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/89608371652.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/ramobegoxizex.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f17319480---lonavisobagixajixur.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcdea3b409---zemevofogowu.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608785ec017be---noduguwexuparepaf.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160786383b0a58---53551742096.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/54l9qshas3c6mr9p2lmduhl1fo/takozumav.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/28379288810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=green+onion+and+chives+the+samePDF 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_off0000f1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AA 10696 bytes
SHA-256: 89be568586091d6ea8345f1c2d47043b7a4e1efd6afb8d5906a62fb52e3ea20b
font_01_sfnt_off00010a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0D 16612 bytes
SHA-256: bf4ffbe48b0459616611cc1ef4e570adef65c12af7a409606ca41cb6ccca0fee
font_02_sfnt_off00013526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13526 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1