Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd5ca2b04158caf…

MALICIOUS

PDF

101.2 KB Created: 2021-07-16 09:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4518bc7d4ea3f15187ec31f02d3ad97d SHA-1: ea8d028c0438965bc77174f47980e502be654028 SHA-256: bfd5ca2b04158caf01788fb384f87e4a0af2174ddb19980af478b5074b59b4c2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is designed to host many links on disposable hosting. The primary goal appears to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16071c9c484fe8---684030331.pdf In PDF document text
    • https://afayl.com/userfiles/file/21758598994.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acddc5585e---92937308690.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210522120023.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/suponezejazekadem.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608248ecba2be---jiwawe.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade28a38c50---99764388824.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607546069d15c---85503452745.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a874bf16d6---lidupivep.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/pu8q0sf19ms3kaododiejr3re0/39114152964.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/32486393871.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/rezalakewudu.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0ac6e7dbfcecccba854e961560b9eb1/37802682541.pdfIn PDF document text
    • https://castel.ro/userfiles/file/siwokasikositojejama.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/a57edade950fb146d576bc5adaf45953/25052466420.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/bblv2ceme9bmqpdpijlu38vaf3/13907854710.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/zuxufepazofaj.pdfIn PDF document text
    • http://godswaynehemiahmbc.com/clients/878002/File/68138882180.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/3071ff4ffe5c820e5fabc2b15a9a5840/juvubi.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/fizoruwok.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/9908f71a9a1d6c1c9959699446510d4b/minarolana.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/wimejawapusoz.pdfIn PDF document text
    • http://baobiachau.com/luutru/files/dasasivigonezol.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e871ffa76c3---22652573266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=prayer+to+padre+pio+for+intercessionPDF 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_off00012747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12747 18636 bytes
SHA-256: ef81c60c163bcff820c249375c06febb2c7b81c26b5771214a40216e2112ac42
font_01_sfnt_off000156a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EB9 10684 bytes
SHA-256: 51174d3132140a503d47fb471c3234fb7c8f31f01c77a79e71e6893fec902274

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