Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2581ef8d84ce43c…

MALICIOUS

PDF

71.1 KB Created: 2021-09-27 04:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 62baddd4420fbc53d90a3ad7b21f2ef3 SHA-1: 83518029b2c4e25ff74850e8e0ddbad8b4b18dbb SHA-256: f2581ef8d84ce43c6fd821933a2b93f91fe42f94e7ae14fe5b634781e2adac5d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-severity finding for a random URL link and a critical ClamAV detection for Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 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.
  • 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 https://nomylo.ru/uplcv?utm_term=dogfight+2+hacked PDF link annotation
    • https://trystsalonri.com/images/file/45773277831.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/94251335046.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/74b770f841e521654bdfbd41e301212f/kokopalijep.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/63082446139.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/zofijika.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff901d516e---37290718108.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/mekelitak.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/jerugokapudebiga.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/segibitalixowelozano.pdfIn PDF document text
    • http://acril.ru/ufiles/files/36286396641.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/lidamepixigajapekadotobo.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/robasakosarunofomexu.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c36a3ba3fb---bapaw.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614ac99e234a3---labixunanipuxadi.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/99112154638.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/6704976714.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/vutuzad.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/dizazuzikogorideg.pdfIn PDF document text
    • http://fittbikese.hu/files/file/88838107594.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/varuwazof.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/6539237012.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/fuvesubefadojuwopawemoj.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/76499955771.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/62935216308.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_off0000b341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB341 10548 bytes
SHA-256: 18d91b73c1f98d710cd8552db9143ef92997f59510839083cb301cbd041922d4
font_01_sfnt_off0000cb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE364 17348 bytes
SHA-256: ebf53267d7b13bd9411190b0846f1b85172139cb06bf6a77528c0fbca38444fa

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