Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e8efaf98762832e…

MALICIOUS

PDF

69.0 KB Created: 2021-09-16 16:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3ffd8b9f784cd3afac951ed6ae587250 SHA-1: 878dd9f2daf501d4ea9f6dcb45d1f5d658111f7d SHA-256: 2e8efaf98762832ec8724a154ae9f762f0ff53724a0b57b5c2195d9d98c11e68
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The file's structure and heuristic firings point towards an attempt to exploit PDF vulnerabilities or lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://vayamcs.com/content_files/files/mejebolukokikivanop.pdf In PDF document text
    • http://nhahanghienminh68.com/upload/files/74119454084.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/53538792431.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/rozakexufibizuledesuxufan.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/29745746990.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/wosoxepedopifapewov.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5fd75c6b5---tivugetivopusosoruwuvaj.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/javigolesuwa.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/7788280426.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e605ddbc9---39063150505.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/povenobatimexulurebevud.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/12965645875.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/2939984932.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/67226174600.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1630824624_1.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/30412367405.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139977b2e833---kepuxefesovugoviroku.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/90131245397.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/bupezolibavapurerelamesa.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/maxoxutokotig.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/807148295.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/35672475960.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/15423235550.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/4b61cbcf2b118b87ee6bb17827b5d981/81913689730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=gta+5+for+emulatorPDF 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_off0000b2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B5 14764 bytes
SHA-256: e7165124ddbeabebb5607382d0691aa8c3e01e38fbab277f4f5a78d5c1e50438
font_01_sfnt_off0000d784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD784 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9B 10284 bytes
SHA-256: 846d56b44880fcd3098dcc6713e526e3249b6b0866b4fb5541988f258678978b

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