Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a70e9d122510ca…

MALICIOUS

PDF

94.6 KB Created: 2021-08-12 12:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 115eef87ccd894990fe2e74a07303537 SHA-1: 64ad2434f32421c3d738fc2e8a014baaa780388f SHA-256: d4a70e9d122510ca90a11e081c391a9c33f3c7e2e425b3dc6aa94a2079a0c359
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised websites, likely for SEO spam or to distribute further malware. The presence of multiple links on disposable hosting and compromised CMS uploads suggests a tactic to obscure the true destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963b381fa7d---xiniresalotemixugaka.pdf In PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/0d0f41a90ecbef6622db2d14951a7c79/nimewujukozinolak.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16097409be6dd8---26658434159.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/b7208660a70d13477c05dacec30295e1/fowaxo.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/ba758cfcee4759054bc7c4deaa1c2d03/41980876420.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/30082086669.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa60ed64903---nawunijin.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46a3ea62dc---virologisewuzovi.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160a70eb2cb966---zajexive.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/a27718131bd048f7be9864c3db92a2b1/tenotubesavadupinoni.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/501ab621bf2b624956239261abae2a4f/gajak.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b66dffa6880---fowowa.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e8522bcc87---dowazig.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16078569b77a84---44257105818.pdfIn PDF document text
    • http://brlairport.com/images/file/minenojozobut.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/32c46u0aadc4eug9r7fuequirk/54522944047.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/77270431665.pdfIn PDF document text
    • https://service-panev.com/userfiles/bilesamimofavajalida.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/mufirololabumaruxemano.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e0eb481d056e65f00e1dae0b3e853454/wexaravovazavuxuko.pdfIn PDF document text
    • http://jaatkinson.com/userimages/gixagukogavud.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/44362994172.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/satimujedogiro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=what+does+e4+error+mean+on+omron+blood+pressure+monitorPDF 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_off00010cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF1 17764 bytes
SHA-256: 886bd6d06038db45c1253801d457d1dc4c298eec0b6a0f3df1d847be9135cac9
font_01_sfnt_off00013b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001538e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1538E 10968 bytes
SHA-256: b6445aa8fe864d90bd560fb83c824273588c2101710fa53d09d741cdbaa94c5c

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