Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e558b25692cdda…

MALICIOUS

PDF

86.4 KB Created: 2021-09-03 01:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c37e5a1e9b774966a9111acb2389ec36 SHA-1: cc6895e2655eaa1b00aa216d641582fba2b53530 SHA-256: 11e558b25692cdda6ad55b421306891245492c412909c00dc36bd8120cdd330f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URI and link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=scosche+boombottle+mm+manual PDF link annotation
    • http://ogledalata.bg/uploads/pages/files/60315994794.pdfIn PDF document text
    • http://www.hmh.sk/files/articles/file/69235693422.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/mojigafodasirebadodusut.pdfIn PDF document text
    • http://ridendo.cz/files/file/33122700466.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/25d6fed7befbc0a7a330e74f62a5c7a4/60452203980.pdfIn PDF document text
    • http://93564497.com/userfiles/jijamaredamuto.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/87975630825.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/170748babe2d30b30bb9921677cd96bb/39518915802.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869284364cc---62618353498.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/0b1b624bfcc5ab8f4275d3cf4b5cc19d/7646382860.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/bopudeporu.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/76904592181.pdfIn PDF document text
    • http://robinsonfamilyreunion2021.com/clients/7/77/7769cd5c98d63cfb9738ae2db1c5c42c/File/gupugidadubinozatiwo.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/10581131097.pdfIn PDF document text
    • http://myredm.ru/uploads/file/93375610288.pdfIn PDF document text
    • https://togeltop.net/contents//files/suluvu.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/17640433041.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/fa8866ccab24920bc49353ab54df8380/womadikulosiwikamope.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa4f5df396---jebux.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/80fbe2644dfe75a209b624afb489ef7f/72336969146.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/larulexubasosawelefavaji.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/61634982625.pdfIn PDF document text
    • http://dztechfin.com/upload/file///fagomezetek.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/71053358106.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

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_off0000e9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CC 18432 bytes
SHA-256: 52f79b9345ff7431baa00bbae3923975a909bcdf847600e8eb314855395615ea
font_01_sfnt_off00011a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A08 10616 bytes
SHA-256: 8f8d35098a7f115d06ce50e676734381d0418b992a6fbadad49370913dc9fa0c
font_02_sfnt_off00013225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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