Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f68fdffaf32958a…

MALICIOUS

PDF

85.2 KB Created: 2021-09-18 23:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bea28086bdcafaa76eb647d96bed44f7 SHA-1: 25effb3075e5904863477e38cdc5f26f5b21d6ee SHA-256: 5f68fdffaf32958a0125ac32b680d367a7a841c18413fbc7a8b0014e94528b2e
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous URLs, many hosted on compromised or disposable domains, suggesting a phishing or SEO poisoning attempt. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly indicates the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://aajude.pt/backoffice/ckfinder/userfiles/files/tozolekivaxedogogu.pdf In PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/61473248197.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/17583166483.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4ba1b89cf---88494017197.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/49660153291.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/39370926184.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/18767058221.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/kegifevametogasa.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/65207112699.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/72672149076.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/kogef.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/dutawoveve.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/96412593788.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/guviraduvageji.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9a19a775d---kenorepetoj.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/sisatopefexilemabaze.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/a03794665a655453b7a86ab68a013fcc/75805812823.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/3c404df43297dad49fe0bc7c2b1a3a92/xijexekikesob.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/pixusol.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/3431654519.pdfIn PDF document text
    • http://floramarble.com/uploads/82473868790.pdfIn PDF document text
    • http://swift-tw.com/lcc/upload/files/tatodevabes.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/1572572202.pdfIn PDF document text
    • http://sbcnepal.com/images/file/38638166483.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/ximojakawusi.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/metefafut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=xbox+survival+island+seedPDF 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_off0000eb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB58 16552 bytes
SHA-256: 9ec3201d3612bca71dcb282d722d4b672130c8df9e6307bd9576a9385899f044
font_01_sfnt_off0001168d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA4 10560 bytes
SHA-256: c4c92ffc4d551ab0eac7f3a8fa78760e3794e8cfb502806daeaa86ae02987879

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