Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b9ae8f76f514e6…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 16:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 9d160a5e2fae79415e621728e6c87e59 SHA-1: c0ddc0011ba4baa4a37da4066b2123b57976bdb9 SHA-256: 78b9ae8f76f514e611daebfa810b887dedb5e911bb352767bc918134ffd265bd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised CMS upload storage, suggesting a phishing or malware distribution lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to bypass gateway security. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://smidgel.ru/uplcv?utm_term=como+criar+pastas+ocultas+no+android PDF link annotation
    • http://kliknetezde.cz/admin/obrazky/file/safilat.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/zariwakedovovumedovij.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/eebd86373628ddef211f8a50fbb716de/4617834787.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/mepasadixidarado.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/pojodexipuxumopikokelalab.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/54641077272.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5ef5a0b79---kibafum.pdfIn PDF document text
    • http://ceroki.com/image/files/riguxidajubanafu.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/ridopawodipuxud.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/96640024787.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417506251c2---kurusadozosakesijuxi.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/toramedefokaj.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bcf34aea0---12920625310.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef63632c23---fofuderotuwudob.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/risozijugamamu.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/161428cf5f1421---28691017301.pdfIn PDF document text
    • https://rm-parketi.si/uploads/54565333012.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/90231950635.pdfIn PDF document text
    • https://posh.hr/files/rusodiriwezasisenu.pdfIn PDF document text
    • http://geoman.cz/data/file/39591739333.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161428dcc4bef7---xomigabap.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/vusejadimuw.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/vabidosabazidaleleru.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/5792690442.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/wikutegowuxibep.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/mililekibofuxakaz.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_off0000d1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B6 10676 bytes
SHA-256: 6665bc5cc9a897a16269860fe796c1b453c2f64c2b7484eb5c95d1ed9d6362fb
font_01_sfnt_off0000ea27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA27 19364 bytes
SHA-256: 63ed04bfa9e88bedf445067b73f612b7f1b29dea7295add6f1d2eeb3c14456cc
font_02_sfnt_off00011a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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