Malicious PDF — malware analysis report

Static analysis result for SHA-256 21abbd228b95b1bf…

MALICIOUS

PDF

76.9 KB Created: 2021-09-26 12:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 02d717df9934b134acee4d6241c346ff SHA-1: 3c635965fdc82c8ae7c9d2e6164c56d6266c0b7f SHA-256: 21abbd228b95b1bfd050f7910a849e0a3a673e12d1025e84c4c0e8178a8214ac
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and UTM parameters further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://laborke.ru/uplcv?utm_term=best+skin+combos+fortnite+chapter+2 PDF link annotation
    • https://togelunited4d.com/contents/files/81927142906.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/bac5f363eeb0146bc089896de23b275c/figetisodebidovef.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161450fb6e6bb7---majake.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/pefegewojapiretomaji.pdfIn PDF document text
    • http://pactolous.hu/upload/file/71256312359.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/fagibufezu.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/93880168518.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/73193256006.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/4965273529.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/dawipawawiworo.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/62734352421.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210911_062214.pdfPDF link annotation
    • https://khonggiansachhanoi.vn/uploads/files/kolixudag.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/45157793221.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/mupotafuruxepavijov.pdfIn PDF document text
    • http://guitarenko.fr/img/files/24588723210.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/42424707555.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/kivexamed.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/73760970821.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/89c4d76c4be3d58db614e7dfe5ad164c/63126081301.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/japegafelezekijefoduxis.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/zufawinidepin.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/68190690954.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_off0000c0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B4 19852 bytes
SHA-256: 541c525c16502683b722938a2194655d687564fc716227aa72160369f670d27e
font_01_sfnt_off0000f44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C62 11104 bytes
SHA-256: 2ecca8b8e93cd4b1a12a4158987d04340334c8a7c8ba3d4dd89d46e0ad16f58c

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