Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be0374382e2e017…

MALICIOUS

PDF

84.4 KB Created: 2021-09-13 05:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4eb4697254640485e80b9a5049ea86c5 SHA-1: aa41859b185d3a20159a95ab56f8b0ceb033fbb6 SHA-256: 4be0374382e2e0175ca836215c5631391905d9e78f497726dc5c6d10e77189a7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/nufabafemidoxazozedegofol.pdf In PDF document text
    • https://zweefvlieg.net/userfiles/file/dozewufeletudigijudupipif.pdfIn PDF document text
    • https://csodamalom.hu/files/files/58233773260.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/70193908434.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/58143686971.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/69982071254.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/noxut.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/95749587183.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/sufamejap.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/1c3bfa6e6b51e5175ce21d5772bb939e/mimuwajikububora.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/29587710032.pdfIn PDF document text
    • https://songhongresort.com/img/files/87804948108.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///pigixa.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/32364701372.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/95034925336.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/mitogasale.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/pixetegab.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7dfe0f639---49374058566.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/noferenobalugapugel.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcc4098eb2---fajosinarazajabo.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/99160423204.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/vapemilejuvagosin.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/zajobavatidule.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/22872226947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=trip+full+movie+tamilPDF 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_off0000e2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FD 18968 bytes
SHA-256: 5eca295d923690dbaa2f648cb220fd9e2b95068356506a6be9c26eecb2596024
font_01_sfnt_off0001142f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C46 10376 bytes
SHA-256: 8c13652df4451ed6fa07179692416c2e20cb7b33132c7291f70d3fe77f8b7cf1

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