Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44380f7915f7638…

MALICIOUS

PDF

77.8 KB Created: 2021-09-02 07:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 85ca10c393664ec6b335dca366576d59 SHA-1: afe165bd1c60f04b105072129847bb237320a7e6 SHA-256: b44380f7915f76386a3d33f08b6176e49fcdce7a9660e2a7a89e51a18bb12e29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://cructi.ru/uplcv?utm_term=marvin+architectural+detail+manual PDF link annotation
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160921bf6ab874---99419869473.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/84056548016.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00afedc100---12349347761.pdfIn PDF document text
    • http://lg-palette.com/upload/files/tisudejupeluwixosufabu.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/logedinamawe.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/dalajuvezeravetadijiz.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/13148465044.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0fcd6a80d---zufar.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/5ed871991ecc1a57962a344f8e75ab87/lafebinezobimatejatu.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/20786995303.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-8-19/20210819140936735064.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784f762050c---39804760546.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/rezobomenajuwewud.pdfIn PDF document text
    • https://realschoolspirit.net/scauserfiles/files/45364698110.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2cd7ea67d---nefifedixukufumi.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/45721707020.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/tisegupudutaxixad.pdfIn PDF document text
    • http://pk.mo/userfiles/file/bijulebafanotaw.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/c20c4ca6572541584424bb14bba69f81/24412728918.pdfIn PDF document text
    • http://akademibt.com/resimler/files/11716673162.pdfIn PDF document text
    • http://panova-art.com/files/file/jojojogumemu.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/78987494846.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/30168712710.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/d379a94d02cda0d2298f500dcd4ce0e8/4929911847.pdfIn PDF document text
    • http://healingpawswisconsin.org/clients/a/a9/a991db820639e3552774ed9a746c1e3b/File/kudutituvuzeriranenuziku.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_off0000cb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB86 10508 bytes
SHA-256: 3a8b1c29315c07461dd9bb81f8442368fa13296657728f51fb0c7ef471f38056
font_01_sfnt_off0000e331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE331 17560 bytes
SHA-256: 7c16386d3a79ac62689d9d5543ab10f2be581959b67d67bf4412c49be8e8f5f1
font_02_sfnt_off000110d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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