Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f8b690703ee09e…

MALICIOUS

PDF

88.5 KB Created: 2021-09-23 04:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 498e29e486505a8bbfd34884ab42c710 SHA-1: e300bc3c898a46787927672986a2d90a4c0fa2fb SHA-256: c0f8b690703ee09e47fbc7fbffd4c0dc65904b85d61aa1e37221e539139990f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, and contains numerous links to compromised websites. These links are likely intended to lure users to phishing sites or download further malicious content. The PDF structure itself is a link farm, indicating a deliberate effort to distribute malicious content through multiple compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://lentes123.com/aym_image/files/puletoj.pdf In PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///kulonetat.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6a3320fed---mexipiranoburulo.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/17615376821.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/39478837083.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/dulufuneririkunerelixi.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cb49078c7---pizox.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/pigulivew.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/39333994566.pdfIn PDF document text
    • http://www.juthamasclinic.com/upload/finder/files/16384404821.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/6799011271.pdfIn PDF document text
    • http://dhf-china.com/d/files/zikokonasunobir.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/moferogi.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/kufam.pdfIn PDF document text
    • http://www.centralperdana.com/file/6047894282.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/54005397374.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/wijipo.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/21982974315.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/savel.pdfIn PDF document text
    • https://mkontakt.com/dat/file/81051404098.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/26156065223.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db77a7371b---68878648203.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a383c7cbeeb49f49396be9c372cdd067/liboxifugopodamaxafu.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb87faeb5d---bukekumanoku.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/gafivorab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=download+clumsy+ninjaPDF 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_off0000f6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDC 17496 bytes
SHA-256: 54bcf85a1312f09f23ce24086096272814478b7094685bf2840d1b2d914ab974
font_02_sfnt_off00013be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE3 10632 bytes
SHA-256: 6570f3db47ce7700ba3f68f193b3763ed4f0c2e70d798ff52174a8642c8192eb

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