Malicious PDF — malware analysis report

Static analysis result for SHA-256 856d8bb46b08379b…

MALICIOUS

PDF

87.4 KB Created: 2021-08-01 11:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7dd301590637498c03c94798660e1d8d SHA-1: bb3cc100847ada3c002b4b714d9b6c82816fd386 SHA-256: 856d8bb46b08379b5a22f0eebbaf9afa2bb2c238a4b688fce90cd47e3a9dd02e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of 'utm_term' parameters suggests an attempt to track user engagement with these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=heatilator+gas+fireplace+remote+not+working PDF link annotation
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84d095a0f7---59654246821.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fc2204414e4---movimatagemolomoz.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/24760566058.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160db26566711a---32071187418.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/funulanabu.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/piwalej.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/14846311526.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5ce7a0afb---79021638400.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/30120237619.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160afdf6f057bf---39098963585.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/negexuvikexidamewabebi.pdfIn PDF document text
    • http://skupka23.ru/upload/m/jesovep.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/5123c77f0ad49c3cb194f2ffae3eb4a6/kivexedi.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/neworanipurajawu.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/27554896025.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/vogemitok.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/98330574619.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/4571560320.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/e9b3ba903b1ffa3daad78ab69d9c1a87/78236717593.pdfIn PDF document text
    • http://kalikraft.com/images/file/xumajanadelo.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/najunowowusotola.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18699717a---xowajemutad.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_off0000eff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 17536 bytes
SHA-256: 3037a3a6e96d13ad7bcf30cb2fdbfb84018dd495666bb772e5495e06cbb8d8c5
font_01_sfnt_off00011e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13654 10992 bytes
SHA-256: 67de7838f373dfaca09f84fb5df88f1239f8fc7c00220044cea893de2731a982

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