Malicious PDF — malware analysis report

Static analysis result for SHA-256 78743ecb7923aee6…

MALICIOUS

PDF

69.6 KB Created: 2021-09-30 15:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 713347900e894e0c7e3c8ea8204e2a2d SHA-1: a1bb7d1b3b657d6c088f41658345a50c35f607de SHA-256: 78743ecb7923aee696945d295076d14f122de60526de6451498a232f56940afb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, including one pointing to a raw IP address, and several that appear to be hosted on compromised CMS platforms. The presence of these links suggests the document's primary purpose is to redirect users to malicious websites, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://budapestpainter.hu/ckfinder/userfiles/files/86973820787.pdf In PDF document text
    • http://nova-auto.com/upload/zowebonuxutigenowuzaf.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/23679285901.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/nipofaponikubodegik.pdfPDF link annotation
    • http://glavis.biz/userfiles/file/nigiw.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/60494000164.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/rifowidaza.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/xigugisopejefamopameres.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/j2k4f8gj6g30vh6iak3cathhrp/61141657889.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/livugopufatekisolemeruw.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142245d33f80---49496715715.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/27618933010.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/54c89a12c906c1b6a04df0adf76b1ab1/bejusijibepoxumin.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/fezujamofejiwatoxeteboz.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/lototidozagu.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/divalegoxikakoxofum.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/fofex.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/witusevarubal.pdfIn PDF document text
    • http://cichanski.com/Upload/file/33886863415.pdfIn PDF document text
    • http://hak-al.com/resimler/files/10977620891.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202192918140585.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/nawikidisorakarezido.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/87793277475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=afk+ninja+arenaPDF 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_off0000b04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC861 16916 bytes
SHA-256: ee45608ad0d3419ef9963f5df0656a3a921ff4cddef9f5cf9b31a267add50d09
font_02_sfnt_off0000f356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF356 9976 bytes
SHA-256: f6340f7ee1925daae81f9d5e7533de7d2635ec7aaff9d1fd1967e91a80eaf81a

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