Malicious PDF — malware analysis report

Static analysis result for SHA-256 851f5852bf3772d9…

MALICIOUS

PDF

127.6 KB Created: 2021-07-29 22:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 40c9bb5331c6a38d341433f664421073 SHA-1: 2a97f8b346a7cc2e6d1394f229fb4236a8dd7410 SHA-256: 851f5852bf3772d9345e95e47e62959c43a0c5e3a175d05ea41344073ee19841
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9728

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://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/0fg33l5ak9013mp8r1mag4s5e5/jusog.pdf In PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/01ddfc8f942cf1e0fe1dc7ecf259ba5b/fetotetoteni.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/55f3c455cb4fe064ec29a8f8257e5260/wigovadudogujujejazoruz.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/23397257649.pdfIn PDF document text
    • http://inistor.com/ufiles/files/fobudiviremivopubozewutes.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/88ff0d3a9b129d3c1a8d121698aa57e0/43589975628.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea7d39f68c---62310400447.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608259a86a203---tunukekefebalusib.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/bufatitowatekisugupidu.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ad5d11564---sibewolina.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/badadaxofi.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a24ccc34c---64655546640.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/2o86ht7v8fb0p90r6qo61qfqa4/95976233280.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/92020784640.pdfIn PDF document text
    • http://khacdautron.com/Images_upload/files/marofebajaligejunopape.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/o69f8fkgj6s263bih17o8pgnj8/82871889219.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/gajimapiru.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088da49ccd80---mapurezuwuneb.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2a1b10495---93229059536.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210726_B15B81D6CF4D3B9B.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/47678727778.pdfIn PDF document text
    • http://traviet36.com/upload/files/zizumarugiwivilig.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/vogutinukitigamozufat.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/xutetanexorokexope.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=wj+achievement+subtest+descriptionsPDF 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_off00018c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C4C 17876 bytes
SHA-256: b092239e703b534e49d1f96ff93a6a89b3c2a509dba875ec800f019a6a0468a2
font_01_sfnt_off0001bb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB6C 11164 bytes
SHA-256: 30d06f287fc7f83b00d6534868a0abe3aa842fede827fda9fa0bdfe27962d25c
font_02_sfnt_off0001d519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D519 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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