Malicious PDF — malware analysis report

Static analysis result for SHA-256 efeb75b881aeb64d…

MALICIOUS

PDF

77.7 KB Created: 2021-09-01 02:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 516cdf412d578220747fb7ab2eef85b2 SHA-1: 1bb7149c085ce1920ccc4303f9c7e4783301e56e SHA-256: efeb75b881aeb64df518e792f015a0f67684dc517eedc67f9a577ae474f38af2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://krisoc.ru/uplcv?utm_term=using+the+inverse+matrix+to+solve+equations PDF link annotation
    • http://nikolabartakova.cz/files/file/fesalokogukosirogipegum.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ca992d23ad---sawopililoniramevikaj.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160834830336f3---46278835593.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/90863272186.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608470cd2003e---12925696923.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160818d6f9e0ec---11213200759.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1cf14357d---wigujezi.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607708e3bed62---xikorekimodu.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/40540350749.pdfIn PDF document text
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/fipigajamizuzomovusew.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/velinerivedodepeje.pdfIn PDF document text
    • http://poorclarescork.ie/images/93691550745.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd6709de71---woguwiwetoju.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/lelob.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160860922f24a5---69122483925.pdfIn PDF document text
    • https://p1gtac.com/uploader/files/jowabirojepolokigivakikej.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/193eeff4937d37f154fb978f40b92825/vepobaludivimoxinulup.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/kepusuni.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087713abe1b1---64071797735.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/296ee1d8c2b7f191daa584bb440d678d/tudobopinitumaka.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610732a2e1c29---xonirudegarusadafamujis.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/24494794321.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/1643888135.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/xarewusomirukisazawilodu.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/kajevubotosajoz.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/17120748495.pdfIn PDF document text
    • 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_off0000cc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE432 16572 bytes
SHA-256: 46a1b41702e7d53b1f34cbc40aefb567290c3033f49ed38a1b87c06aa4602dfe
font_02_sfnt_off00010e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E67 10976 bytes
SHA-256: 45c8d94b23c4bf442bfe0588b8425262c72fc3e9da1a8046d71231cf9b88e765

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