Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f12f5a87808c505…

MALICIOUS

PDF

80.3 KB Created: 2021-10-04 21:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e34ff37d986c160a457e3497f30d2cbd SHA-1: cca6d6915ca609093ee0ed034d98e04c5cd1dd24 SHA-256: 7f12f5a87808c50574dc2a49a15e8c78b1bdd5d6890480e8cd23a21f58236054
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm, suggesting an attempt to lure users to compromised or malicious sites. The presence of embedded JavaScript further supports its malicious intent, likely to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://drafthe.ru/uplcv?utm_term=mh3u+bow+guide PDF link annotation
    • https://kapokcmassage.com/uploads/files/202109020720301429.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/6816922945.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/numawimijalokadepozo.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/panagigizimupekixibawil.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/kenimavezusuwunugizet.pdfIn PDF document text
    • https://get.belonnanotservice.ga/away?/wp-content/plugins/formcraft/file-upload/server/content/files/161597489490e7---pomedogapaxilijuda.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/96870643416.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/juzokotagugig.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/zejesusapozibidefuradale.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/ad7b025e7415791d2f5d03d3620a84d1/jowudokuwuxoka.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/xejinorarig.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/73152a112e4d11f8bc2c8b51d9e9273f/98455787374.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/35799725510.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/99425334437.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/dawuge.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408b1aefc0a---wamivikodosejud.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/91606024550.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/51025870586.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6ad82fabc---10643202318.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397e871397f---62268975011.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/kegipomiseluxanafulizo.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/1020546662.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_off0000ceac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAC 10340 bytes
SHA-256: b74c6c7e37c2a8fe1299c61ddeaab34de8906d013f935b6c9dcb026cf53ca823
font_01_sfnt_off0000e5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F2 20432 bytes
SHA-256: 2014a1b8d4a7c3a0548d831c20cbfd937e188b23c6537ec2f35eb7ae82cbc210
font_02_sfnt_off00011a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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