Malicious PDF — malware analysis report

Static analysis result for SHA-256 5811f0c4c0fe0bf0…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 18:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 53b5f9263730724ee2f261b077100a5e SHA-1: f73e30a3b7ceacf8a6c016a1154e7e24991f8cd6 SHA-256: 5811f0c4c0fe0bf0ae2405cccfa92b99c65efb9870d04f29dc8563132d0a4d1e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing or malware distribution campaign, evidenced by numerous links pointing to external resources, many hosted on compromised WordPress sites. The high number of distinct URLs and the use of link farms suggest an attempt to distribute malicious payloads or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://allytemp.ru/uplcv?utm_term=coaching+ontologico+rafael+echeverria+pdf PDF link annotation
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/kipesekesejesuni.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/mamosizenerexoge.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/rasutisomijabukozasagaton.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210820170108.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/20010813559.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9158143f01---roxolidupizazogadusigaf.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/0c8cec9bef7357ba07bbd4cf6709f25a/28209618768.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/317352358eca227fce85d7088146071b/45711856187.pdfIn PDF document text
    • https://medtek.vn/storage/file/lorofukuvaju.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/sh6rm6uc9glkkoji1bhtbmtoo4/jurezesotudafusazuxokoxa.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/95988115563.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/94770010668.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcd33dfc61---surefebutanurasid.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/6d4cab203337e5320ce35836c8e38506/44329597589.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/68768481264.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071376edc768---nugipuz.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607366c86cf26---9552453129.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f586e6af27---kunoguxugufatuzo.pdfIn PDF document text
    • https://fallsplat.se/file/kunezakovigewate.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/mipanakemefolozotonabanu.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160915c5484661---60922215678.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609daf66c7509---tiburojakilaluzi.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/d5g5n2q1fhdbv0ch32t00u5vui/6628208240.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_off0000dcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAF 10828 bytes
SHA-256: 550cc527d10e522271c53f36dfaf58fc42636283bfdd0f46adc2aeeb6c47163d
font_01_sfnt_off0000f56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56C 18212 bytes
SHA-256: 6f1f4f7d392eb0face8a6c4fd9e3210d41bfe79e936a1c950789729e0302adca
font_02_sfnt_off00012461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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