Malicious PDF — malware analysis report

Static analysis result for SHA-256 df261a724bb33f31…

MALICIOUS

PDF

79.0 KB Created: 2021-09-07 00:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 91ce0258046ee9ccf621013fc2accdc1 SHA-1: 8e568531c474befe275eb93d204d3a34a04b1076 SHA-256: df261a724bb33f316bb48d9cc3646471d1d1d8147bfc623f26c2b2ac08af81a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, directing users to multiple compromised WordPress sites and other potentially malicious URLs. The presence of embedded URLs and the overall structure suggest an attempt to exploit users by leading them to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=we%27re+going+on+a+bear+hunt+worksheets+free PDF link annotation
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/e19712e14d708a9d3b1eb0294c7db9ca/bekatijasokati.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d6622a5ce6---42155209350.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/21086422497.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/b33bc9c72bcf8bfaf5d73fbd2b1a8d28/54774561944.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/33610933200.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7e0fccd88---kafotitodemanesadapeb.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/rakoxegitogofotosuva.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/61715159256.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/64586281385.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/manabituzu.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/44302201489.pdfIn PDF document text
    • https://tmtteks.com/files/64212358996.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f6b75a13b---17741360977.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/0iths8qb0h7qhag402hr1pvtmu/69099137833.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/vifakos.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/bulomutuxux.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/cbdeb8f0e3c1a38564fbf2f2bedf2659/memibupa.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fe9ff85729b---22998540243.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/zolezimo.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/58933125292.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/duxinelirubakuwulusorav.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/fa4n4s9r1opbtrbabtp0f28m83/46901906197.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b5209fdbb2e---kerugaso.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/59452753301.pdfIn PDF document text
    • 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_off0000ce98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE98 18012 bytes
SHA-256: 1f00deb4db245a4f86fbec72a2db2fcf5b323f460b57650af2a98b4a5960c7ff
font_01_sfnt_off0000fd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD56 10892 bytes
SHA-256: 7404f1d44ff2fb89639a81625b41a5c55cc8190568d78e6708bcca1ad55bbcc4
font_02_sfnt_off00011697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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