Malicious PDF — malware analysis report

Static analysis result for SHA-256 187a07ec9563e272…

MALICIOUS

PDF

98.0 KB Created: 2021-07-26 20:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e726ea832e751cc51ead6aff5cf4c074 SHA-1: d3537b400b639a208ddd81ed8630545d9ba5131c SHA-256: 187a07ec9563e272a5e41b40e80dbb0896478721060f73478e596331bbdb6875
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://deepakbatteries.com/uploads/file/kujukitelowosubo.pdf In PDF document text
    • http://dashoernerboot.de/userfiles/batukibalikufepozi.pdfIn PDF document text
    • http://446888.top/userfiles/file/mimelofefenu.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/dosewezufari.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/boropujeted.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607faae3606e5---rizizirafufepakeri.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/1p14vb3sbj4kf8rp2eiij0r0ur/27471064139.pdfIn PDF document text
    • https://festacontinua.it/public/file/sigefamu.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0620002fc1---68585523869.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/2931489ef7eba4a1c4365979e6a71e63/vusabigikoriluwimevo.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160883ccd08aca---70788424596.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/nefupubu.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/b0ce5d51993c0f9bfaf3d64f62fc0ace/sixugufesavelala.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16090f668bc03a---36466055264.pdfIn PDF document text
    • http://championsview.net/userimages/63844818186.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dcd35f98e---lirubesu.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/97130148298.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/0110ce39b2568d6057c56c77ac3096c5/92650355739.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/44576658228.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/80981203533.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/e7c389b087692cd093ecc7485a3b4974/50879757332.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gafedugazupumepumi.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c905dd21d6f---vuweravorex.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/53546618198.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/belojisumabew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=20+ejemplos+de+lenguaje+com%C3%BAn+a+lenguaje+algebraicoPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001149e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149E 11388 bytes
SHA-256: f7b1a524cb75f52a98e399cb9adc5cf61f448ef5ce9da4ce880d4d9a7cd5c47e
font_02_sfnt_off00012eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB4 19580 bytes
SHA-256: af105b4ac1999653c4ae20f309e58bcea86bc253459d82f4be654eb5359c93f6
font_03_sfnt_off00015fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FED 16324 bytes
SHA-256: 79301701c9be490244d95d0d09bfe9394de1a3f211b20e770ed184d7e7510369

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