Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f284a5a7f640e95…

MALICIOUS

PDF

70.7 KB Created: 2021-09-08 10:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5b46e9158fb1883a03b55a55d655dce6 SHA-1: 79aa86bb5ab7ad10f6e90bb9b3036de8d6e3b856 SHA-256: 7f284a5a7f640e95218c4f0191ea8135683bf2c7db1ee1adbb509872e780a7e4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers, indicating malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics strongly suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://lagerunda.it/public/upload/file/71147925150.pdf In PDF document text
    • http://chickendaylacrescenta.com/uploads/files/nusidutixorax.pdfIn PDF document text
    • http://partnercable.hu/files/gabiluzawobabut.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/76723966771.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/xuzinozefutejave.pdfIn PDF document text
    • http://ledesmasportsmedicinesavannahcentury.com/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/56211649851.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/nujiwovone.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/df80beede0c904d5ef790f27e675a627/jakulapeboriponarisam.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609867f0bfc9d---36445548349.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210620_09CC9A87DD7253E3.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/92910263759.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/22437765797.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e76cad4bfde---tasopukagozunugujidasapu.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9d1e16939---92401219564.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/9245261668.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/koxoxagejodeje.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a1e9a828b---71779418368.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/58700962116.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/79605685193.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608366b774935---2591261650.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/gpoq70iho68r98tqv1upto4j1t/19114229323.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210902142433.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/37057690139.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/rurugupavabizedarakejur.pdfIn PDF document text
    • http://lblussana.it/images/file/vefado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=importance+of+drama+and+art+in+education+pdfPDF 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_off0000b7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE5 15004 bytes
SHA-256: 1316727548b4772a028378493051640bb4b3839e8977514f8d83eb22063fb0f2
font_02_sfnt_off0000f4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B7 10620 bytes
SHA-256: 359ea85ca01b857f22e5d70431e4bbc9a52116bec2a4d6cb2811f91984ed264c

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