Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ba112638445eb05…

MALICIOUS

PDF

84.5 KB Created: 2021-09-23 23:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c606cdbf32c4f4abd9152c2386a18d96 SHA-1: 8d87c0939dbdbf7ccb75e08a1b06595add00e116 SHA-256: 9ba112638445eb0533875566b28d5a2ad841eb7ac7fc23cfd742cd61583a34d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is structured as a link farm, likely to direct users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://allytemp.ru/uplcv?utm_term=yugioh+duel+links+hack+ios PDF link annotation
    • https://balarampurblock.in/ckfinder/userfiles/files/74873078948.pdfIn PDF document text
    • http://reichspfarrer.sk/file/gapuw.pdfIn PDF document text
    • http://teraval.cz/res/file/29447835504.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/xidekigivo.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/kidipufitujumadefaz.pdfIn PDF document text
    • http://chayka-svg.ru/files/31716612323.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/15726308617.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/1756078539.pdfIn PDF document text
    • https://www.patisserie-flechais.fr/ckfinder/userfiles/files/4018432256.pdfIn PDF document text
    • https://teamcode.net/upload/files/sexuxekurowazelapat.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/lemozolin.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16140a0dd5e924---32402969660.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/zexofadaxevar.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/nufodemakipuwelolot.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/50019593563.pdfIn PDF document text
    • http://gro-felix.si/uploads/jixolonoxam.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/wigifojigawerijomefa.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/padimuwufogixadix.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dccd93ee2e---nutilulowidowulajupajami.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613125da7f1d7---16053332543.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/95832263713.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/norosojufubu.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/98544456951.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/wimagoguzugelitosu.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/74583964139.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/49867727038.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_off0000df46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF46 20576 bytes
SHA-256: 243b9b875dcd7ff61e51303e78f24bab575619672a062dad3e57cd20c8b25886
font_01_sfnt_off0001145a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145A 10628 bytes
SHA-256: 2f21694818912ea153f1dc867a038609c5b73a9bc6cafd5c45012a75b8c8dbe6
font_02_sfnt_off00012c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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