Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd8513510f5b6d8…

MALICIOUS

PDF

75.7 KB Created: 2021-09-04 01:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 515f07ffb638e4f71eeb9eedbbe90470 SHA-1: a6c697ee912636942e7aeb46e8a30c9d89c93a69 SHA-256: ffd8513510f5b6d8bd53c9a1a0a6c2c5461f7c81ffb1a5b80866bb8c2d180bee
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple PDF files hosted on compromised CMS upload directories and disposable hosting. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://fioredda.com/userfiles/files/93267511533.pdf In PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/29422650159.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/4fd7b5593cf23585810afc40cfc7e6ab/36516070321.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/as3m711me7i0fkug6dlct3dn07/25525475067.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/jesezijiw.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/bolaguxepamuj.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/50212140337.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/teses.pdfIn PDF document text
    • http://takeacode.com/user/d41d8cd98f00b204e9800998ecf8427e/file/12694804979.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f52d6d831---39450249642.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/27864320305.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c879544584---73055589695.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161084c9871576---12463905030.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/310a7784eb1b008b59cb0d76e552c65a/18406453432.pdfIn PDF document text
    • https://iiml-pgpsm.in/ckfinder/uploads/userfiles/files/soxiritotavarodivawolu.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210817074119699.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/7f1582fe8499d1408b857ec4482fef6b/18725412706.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/tukufo.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/dd6094c122a19c6e1bc6355081862ab7/jofuwirewujedin.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a713d8852c6---fufowoxolis.pdfIn PDF document text
    • http://xhzhengli.com/upload/vexafixotinafibowafakofod.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/mkpms8t7qsekvtbenf0ce574c4/19530245032.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/foxorexopexipidiwop.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/ce19398669a7c61ce783d9ea0dd80824/46932945130.pdfIn PDF document text
    • https://congchung7.com/upload/file/78190272617.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/limaxuxifetalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=manual+pallet+stacker+perthPDF 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_off0000c3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F6 17368 bytes
SHA-256: 561a7ec6a5eb791f4019c4ec0f4882a55cbb06ab105710dc43f75ea77065ba6d
font_01_sfnt_off0000f111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10928 10444 bytes
SHA-256: 8813185b7a5ca0fcd815050ecfa249ddb374eccb0e575c26f5385744dbb4186d

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