Malicious PDF — malware analysis report

Static analysis result for SHA-256 a50478f0f2453a82…

MALICIOUS

PDF

77.8 KB Created: 2021-09-07 14:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27637d09ade99fc675cc175e2201f7de SHA-1: f650f92c124152089679c8fdfac2f3366e1bcf7f SHA-256: a50478f0f2453a8222a7789186f162a61db3a4ec828a3ad5b689dcc4ff6054a9
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 link farms. Heuristics indicate it's a link farm on disposable hosting and potentially a phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.truca-taoules.com//ckfinder/userfiles/files/kawuxilupujuwu.pdf
    • http://aliceinformaticasrl.com/user/pages/robukepi.pdf
    • http://rlmlaw.com/images/edit_images/file/85701175012.pdf
    • http://parzenica-bialka.pl/userfiles/files/vulajipifug.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c70780af165---54939556317.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/c44a338e81970646c2a44615814f42ba/19128730271.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973b44bdbef---46114198735.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7082aa4f0---62941952168.pdf
    • http://nkmate.com/FileData/ckfinder/files/20210823_5C53E2F622718770.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/3b88e6931a90c6ca925f477d154fb09a/5287916072.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a393943294---43803901860.pdf
    • http://voijin.com/userfiles/files/konizoxim.pdf
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/getemikaf.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611599349fbed---54392527050.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-5-6/20210506234815195408.pdf
    • http://airsoft1.ro/files/file/zofizelajipejipogaviluxo.pdf
    • http://aroma-es.site/yamituki-n/uploads/files/sivuf.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/pb8oosl3bkpv86adag3r809s40/4982288919.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/aebhniokfm0v1gf8ld1rb0pvo5/88296503923.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/pffnqs0q0p42mkc4bqma7mtlba/93747007188.pdf
    • http://sciattella.net/images/file/jumiraloxasowoweferogetaw.pdf
    • https://sindonis.com/userfiles/file/35978995638.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/pppbda83db37ukc3trp2bdivof/39894871642.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/lb8f4g9s43ldm14v99rgc9od7d/lewuzumurobijafirisajoko.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=superstition+tabs+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c695.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC695 16792 bytes
font_01_sfnt_off0000dea7.bin
0ea833e08a37057979eecdfac72ade3072197149cd106b4cf558cbd713281463
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA7 19712 bytes
font_02_sfnt_off0001115d.bin
9c9cfb602a040ae93a8358ce2a33a1f5f2e2cf11a1fa27bf0ae4ffdcbddf9024
pdf-font-stream PDF embedded font (sfnt) at offset 0x1115D 10760 bytes