Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78e4663603443d9…

MALICIOUS

PDF

80.2 KB Created: 2021-09-11 00:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9994d7f90f77e89ffd7bf0b6fe3d31b9 SHA-1: c8da61b4e99e57cfdbb980c243ef503b6ab6edd3 SHA-256: a78e4663603443d952c18ead69e5630d8e4229502f9b8a3d8d07106280f1add2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous external URIs, many pointing to disposable hosting or compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The presence of embedded JavaScript, flagged by heuristics, further supports malicious intent, likely for executing exploit code or redirecting the user. ClamAV detection as 'Pdf.Phishing.Trojan' reinforces the phishing and trojan classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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://giolog.biz/images/bulk_images/files/35518207750.pdf In PDF document text
    • http://seosanhrd.com/userfiles/file/zesovuvazitebovesofup.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/88ba03d43162280264e6b5c18ecab15f/xevavulizowigase.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/bobofiwexakuvetavusok.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/21542773404.pdfIn PDF document text
    • http://underbutter.cz/download/foto/74636674895.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/wukivigizaref.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/20685605482.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/78564412770.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16134839e8700f---fovozufilozomanok.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/bojigatarevuriliwapofebuv.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/sogogabo.pdfIn PDF document text
    • http://24cvety.ru/upload/files/81816959255.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/56848904506.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/79862954764.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/35920091147.pdfIn PDF document text
    • http://ud2-140.com/files/27352171956.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109101515566275.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/suvisufonepifud.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/84833888259.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376eedd0add---72132333568.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/89175206805.pdfIn PDF document text
    • http://ustunongel.com/image/files/79813642778.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/tekekemafapidojomubu.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/bikoletenoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=jeeter+boss+2PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 17540 bytes
SHA-256: 0cf70c5e521ff33aad3d754e8dae5418a14b2bb2e414dcea2c3bf523620a4493
font_02_sfnt_off00011db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB7 9948 bytes
SHA-256: 9d88ff8df061c3e26930d49ffd14aaac78b60229af604dc2821d945d4743bf34

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