Malicious PDF — malware analysis report

Static analysis result for SHA-256 79efebdd97d92df7…

MALICIOUS

PDF

78.0 KB Created: 2021-07-23 10:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 72719d0b50f927e80132c999e12785a9 SHA-1: 8a20ca99e489acae5a08d31ec27883a6fb815375 SHA-256: 79efebdd97d92df70958db53f3ea19325bca0fa353d6fdd5f7f2b3370f45479a
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution campaign. The presence of link farms and disposable hosting indicates an attempt to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://indianpowerliftingfederation.com/userfiles/file/kijituwatawubomono.pdf In PDF document text
    • http://optikametuje.cz/userfiles/file/54511787451.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/vofemozedemowivo.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fb19d945d---21911552385.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c20bce4f76b---27701125473.pdfIn PDF document text
    • https://lesura.net/userfiles/file/30374294942.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/25593810777.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e533d8a5c8---gegajewevurivelugivida.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/67163584612.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/58534598614.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753c2fdc250---39681044439.pdfPDF link annotation
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/sogejosagadi.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/fumuxa.pdfIn PDF document text
    • http://goref.ru/files/file/kodoxezekajikawogogapaw.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/4rmcarl1dpsj3ipgg6mhucv444/89328215764.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/bazofemewanepazade.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/5c8j591dbp1trm7pbcsjkor5nb/fukenevatoruxet.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/xegakag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=coc+layout+th6PDF 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_off0000d142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD142 16660 bytes
SHA-256: 28abc959dd5d8652be4e0be64a6a553af415849515b446bd9bf6a8ee3686219a
font_01_sfnt_off0000fc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC84 10144 bytes
SHA-256: 7c7e45761ddd7bdf60ee24a304a3a9b0468ebb02793e7fe91e4eabb900b5be3d
font_02_sfnt_off00011370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11370 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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