Malicious PDF — malware analysis report

Static analysis result for SHA-256 74dac7e5111bb937…

MALICIOUS

PDF

76.4 KB Created: 2021-09-16 22:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2253e13fc2a382f056ea2dd690462d47 SHA-1: 2fdfb08266cee6d230272ee1de1c025532515b6f SHA-256: 74dac7e5111bb93794181cbf46d61b8b2bc49d27b7fd24cf5f248b313016cc01
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised websites. The embedded JavaScript likely facilitates the malicious activity, such as redirecting users to phishing sites or downloading further payloads. The numerous external links, many hosted on compromised WordPress sites or disposable domains, reinforce the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=android+1+robot+shark PDF link annotation
    • http://tsrmmessina.it/userfiles/files/28841666079.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/liloxemididedimodaxuli.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/kusutajinitalosuvonod.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/63891867387.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/60008922893.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/45119690744.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/lafibekajikuwokati.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/fademufutovifenisanetef.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/jevogil.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109011926418147.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/pupixaneregejefuxifiwej.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613dde9b21640---47269135775.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/84373922243.pdfIn PDF document text
    • http://goodmax.ru/i/files/22799922455.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/bepifezosemogiremuket.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/dsllqg92gncgn42bhkos74n0rk/23402100811.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/magakoko.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/27599897026.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/f99b3e5952498b432f5291360c9a74a2/50757100835.pdfIn PDF document text
    • http://screen.by/images/file/winajapitarewakigajubonat.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/81690398452.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/37818099853.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/68949553542.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/mixatojarodowanu.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/tigumavixitusalo.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_off0000c05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86F 19580 bytes
SHA-256: 2464d205eb31bfc236a4220b7adcf4d91289643121603ea096dd6274f6d4acd9
font_02_sfnt_off00010c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C69 10432 bytes
SHA-256: 10414181b7681b130e2fc7b734321cbf2d25e74dba40b010549bc99280785410

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