Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab84d875ecbe8eaf…

MALICIOUS

PDF

92.7 KB Created: 2021-07-13 11:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d7e3cf2e4193c77ead3cbfb1c45ad4c6 SHA-1: b437273a64367e2571df761d9def1d6322d4a2e1 SHA-256: ab84d875ecbe8eaf90ce99189816797c220b657bb4a8f41a211bf620817f1a77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF used for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://mahlkoenig.nl/app/webroot/files/userfiles/files/lezebogabivopotisobelen.pdf In PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/danutuwotaferox.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9af7eca095---35986246251.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/13263884031.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/46248739295.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084314978665---52309995505.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/foxalejavivaw.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838fe24601c---42765854471.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/kibozowizoziliv.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e22c127ab4---penekenarejal.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/wujifokelebuwatota.pdfIn PDF document text
    • https://anup.bo/images/files/vunazejodakadasopip.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8529c03124---83597328509.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/tofija.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a197ca2fd42---kumevozedotigetifa.pdfIn PDF document text
    • http://sdds.be/userfiles/file/7000971200.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/ff76fa072e95184dbc8efdca49fce92d/745302593.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/5paoja5i862d04spbp7avvtd8p/lodokiv.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b977db4e732---puminivevojugefodaperusiz.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/xekukobur.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16073e0d880564---gomamiwiwefusigetibi.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/94808460055.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7c02962d89083ff6669ad15098c86356/31719121148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=back+hurts+from+laying+down+too+muchPDF 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_off00010688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10688 17252 bytes
SHA-256: c586748a232aff2943a36f9c40ac6743631816f8ab2409fc2f681dd482bbcd63
font_01_sfnt_off00013364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13364 11236 bytes
SHA-256: 64f7e2d85ee553961fbf25338016bae7aa57c5818d0d26813f7d6ba26db31cdd
font_02_sfnt_off00014d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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