Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d1c5e836f99f63…

MALICIOUS

PDF

77.7 KB Created: 2021-07-02 20:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: aff30f7e1df9601f82eeed3ca441301d SHA-1: 754e1e8c3870c746c5683b258b1c65dfb92cffb0 SHA-256: 64d1c5e836f99f63a567449ad5fb84e2e0892d144224abd3c73124880d4ae4ed
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/498b312c523114a0e07c9ae24ac21972/66287034540.pdf In PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/96c19139fca747a1c4018021c82e6e6c/15264872537.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/b797e3fbe3d8b2b44d988ab300625203/39420734506.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607941c159e82---52221816768.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/pubogewasu.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/64087620880.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160dae527f25b5---93057346708.pdfPDF link annotation
    • http://zaun-produzent.de/userfiles/file/92487213743.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160741665f3952---1038943312.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/86316464148.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160dc780c54613---71505204237.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8bd9f0f2f---toxazomuxegegikefafosiwa.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607445f55f233---2377605219.pdfIn PDF document text
    • http://lyshiying.com/d/files/88388593774.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/273f2e9fb7834bff806014bfe36a7da8/bazisojupezomibibizose.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca037728547---bavawariwuxipevixaduz.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/dimozirenegikotulazura.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609c92a6eebd3---vogujabojozuwilabelubotis.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/10524921535.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/foduzewedasig.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/86523992795.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc08511ecc---vomotosevavulenitifuneg.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/898149a66938edc6224462cfd9c6be60/dagikopekamafeputi.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/sizosawev.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608591cf1dc84---vijaxipidugisodukubiw.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/hiqqfr0oiimaptg193r790gfj2/42308393037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=worksheet+percent+yield+answer+keyPDF 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_off0000ce5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5A 10896 bytes
SHA-256: f85206737caaf3ef43a45bb5a0f785c6eedff3b8c74e6a21318d037600c43f03
font_01_sfnt_off0000e797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE797 16116 bytes
SHA-256: 3c74cf348a551b8b899d4a37bf231394dc1cfe03a031236a53a9f767293fb083
font_02_sfnt_off00011130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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