Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7251583de6abd3…

MALICIOUS

PDF

85.4 KB Created: 2021-07-23 03:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cd367f14e7a51d120b19044eefec01a3 SHA-1: 7fdfd8830111873a012a0fa0e8996cc2a3a8b9f4 SHA-256: 9f7251583de6abd33c55d4b8c1ceb60a8bdefc5864eabfaa6f6c64363c09e3fe
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised or disposable. The primary purpose seems to be to redirect users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://fandimnarodaku.cz/upload/file/21729186625.pdf In PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/5lcdnon8p80o6beeettu7qem2a/xolodageku.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/93607803297.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16077336d4a3b8---tefuzomifisi.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/vovim.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/mawexetarurakebojanudovok.pdfIn PDF document text
    • http://guowangcable.com/d/files/93597219387.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/gojimemokulapikolifaxam.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadf8d2990---53965234033.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/2dl5ibtvlt8afep0hiu02gme53/wegir.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/kt47ahn3kosfm39cqm5v95gmeq/70579664452.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/sipomo.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210611044349.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/67171722039.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/50130219815.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075767e8d40e---kikuzupagaxipelebunoxaz.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608930983a8ad---lazav.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/8931006fe9820ae4d22020b0b198ffb8/54910059415.pdfIn PDF document text
    • http://mastersequipments.com/ckfinder/userfiles/files/pifixabijirul.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/5c14e7fba9fe1415158ff27b42d542ee/18338486502.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/wanatazekumamivifetejelex.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/dalisasidoluvubiz.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/0d5dd509b216ea401fa5c1ea1da73973/tutozujafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=imprudence+and+negligencePDF 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_off0000e838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE838 18924 bytes
SHA-256: 1e8cb9e0ccc9b5236b412eb82d7e0d269578966c4029661e18635ebf633ac3e1
font_01_sfnt_off0001177f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177F 10520 bytes
SHA-256: 0d89970ed2196ac226e7d7b34f029674ccf46e773855e5b7ff80fba700c70c6c
font_02_sfnt_off00012f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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