Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dfb5bfc9f4f10bb…

MALICIOUS

PDF

68.8 KB Created: 2021-09-24 16:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d97bb915e197fad3d8cbdc64b8275b76 SHA-1: 12f1f6761fcc43c9513314a75641bc04ca95289d SHA-256: 7dfb5bfc9f4f10bb91089d35b350dd018d67a35139d160e713f853e1f9a65a4c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://medvor.ru/uplcv?utm_term=whack+your+ex+apk PDF link annotation
    • http://gocchame.vn/app/webroot/img/uploads/files/37730757663.pdfIn PDF document text
    • http://sin-hua.org/userfiles/74466269766.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/41417a9bd15bb5690ed9c65c2289daaa/99285593652.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/lajoxamaluxale.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210907020529.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2c428c365---65937224124.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/24201138023.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/7895149727.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/winivagupoleza.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/nuvoronebemifotuxiviser.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/75140954691.pdfIn PDF document text
    • http://safetruck.gr/images/file/mexazabajifuvu.pdfIn PDF document text
    • http://letdentalab.com/img/files/50207820911.pdfIn PDF document text
    • https://olivermilk.com/tctt/sites/aaa/file/20179769184.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/78892431266.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161376b46bcade---lemif.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/nipasulexaloxe.pdfIn PDF document text
    • http://gnox.vn/upload/files/belikugu.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/cafbb2292c06daaa1357c9d96d3995be/98483159358.pdfIn PDF document text
    • http://robbes.nl/media/files/vovaweronageguzibolimuwob.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/zazejedinukarenisov.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/kokiwudafeda.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614d898cc0ec8---40804453686.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/puravanejexodu.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/91049284587.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/14159846014.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_off0000b0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C1 10364 bytes
SHA-256: d8c8e7e15074c661c17f905e947697be604a8284629f3f04d5adc1bedec70971
font_01_sfnt_off0000c865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC865 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE077 14956 bytes
SHA-256: d7b4d2bbaecd3a3d72147b1f1255fdde62708e22b655feb750c771dc4ddeaf18

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