Malicious PDF — malware analysis report

Static analysis result for SHA-256 509c89c739affe8a…

MALICIOUS

PDF

94.0 KB Created: 2021-09-05 21:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f79031efc21cff996a7eb47237a8d799 SHA-1: 91d02ae11b52eb48dd03e4af3d48c7a39cad6e3c SHA-256: 509c89c739affe8a5b161f910f72b22c92d13e7e1b3d1cd921498820274a038f
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, a common tactic for distributing malware. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be a pretext to trick users into providing a password for an archive, likely containing a malicious payload. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/uk5fbjtmb3o5lc0e4f1dn63pd0/fibenewilejulur.pdf In PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/e1394430e802b25b7e2277a97129c366/vefekiz.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/97d692ff6511f81e5b90a603fb4e0b12/xubebefawoluzinatawuwu.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/677db4f93a227466fbc0d5abee8c757c/78043342311.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ec4272425---firopigusugesetedudojip.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/57560906530.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/60962563520.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/epvaedhftsvlajtjmf0u54hbk0/motoguzotegiruvufasedaxiw.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/6cq9gotvs0ls8b9fpqr45ehnhq/83290236161.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/xifetutazodujuwojaval.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8596fc13d1---30048438128.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/buninitubopulunas.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/tawopoja.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/junuwojivogugezire.pdfIn PDF document text
    • http://deauville.ru/files/file/tiwit.pdfIn PDF document text
    • http://air-ned.com/uploads/files/nojoxekife.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe5831da60---82213620895.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/povederop.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869f809b5a3---riragokewamoke.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/nurirununu.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/dofopesururunaxedaxet.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8a0b2f3b3---59141089371.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/kalafodupav.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/56084118100.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095c6e9efdb4---11639979692.pdfIn PDF document text
    • https://wittnebel.dk/file/76974250942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pals+pdf+ahaPDF 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_off00010a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A42 9952 bytes
SHA-256: decd5d0e13c2312905579cdb9188992a1223bbfa8f619b2d3890a951186d4111
font_01_sfnt_off00012055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12055 19488 bytes
SHA-256: 5019e0034237387c2714832463d76b253d3c9a49ccbdf6fb67e26a6a2e6cc587
font_02_sfnt_off00015273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15273 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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