Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3541dcab021a9a8…

MALICIOUS

PDF

80.9 KB Created: 2021-09-04 14:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 474e05a256a8029be87db20288d11057 SHA-1: a418d7f708599b6ca0a03c9266421da3993dd24a SHA-256: e3541dcab021a9a8de6ad37e7ae5f1483abdd3652ae98c7b882969351513a670
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://styropapex.pl/userfiles/file/81777451072.pdf In PDF document text
    • http://tunesistudio.eu/userfiles/files/98151825378.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/xefanepupevewok.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbd436d818---wukebuxenizedowovexexewef.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16126d25da7af3---25806818327.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/52652050647.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607404d0ac384---43933057724.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/50492309333.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/titewofutezodajiwe.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaaabf04e1---sapabikuwu.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9e93cb7e3---15087931653.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/deteruze.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/zofesikopukogar.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921a91f12fa---morepuwelunotilikidupiza.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/23919006259.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/87906826445.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/suseredekuzuresezorofu.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/luwubifapugobidekuruli.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/9c0e4f90b7a207049b10bdc9fd7e18b1/tujozoxumaxuwalel.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/jifikaw.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a73bcbc09---37902687803.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/e759d2fdc47e605a6f207270bbeb61f3/wexuxamujewub.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/31098874662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=percents+to+decimals+worksheetsPDF 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_off0000d56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56A 10816 bytes
SHA-256: e4d7bae3c6b2a96f72c89ec04440e0ee0f796a1bddf382a4d3904e6f75b5ec98
font_01_sfnt_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10654 17852 bytes
SHA-256: 923a0ccf88c7635aed4abb1d04bec9011b9503b7b12fe3fc4307f0658872fefe

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