Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c428bbb745727f3…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 10:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c5c86026981dc9343de46c328880db4f SHA-1: 02475e9f8526f03e48b70bf54955e7c87e710ee2 SHA-256: 6c428bbb745727f39d02ad22860f67d44af3f4b58ccdcbefa0b5e2b128d3cffc
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. These links likely lead to further malicious content, such as phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kisikana.hr/userfiles/file/nosudisorulenelija.pdf In PDF document text
    • http://limoride.net/gallery/file/42751297368.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075da951b8ea---tafasapubamujasetewafoji.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/85305348189.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88e1adc0d---86286374802.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/12a3bbc0d62d4787a7f59732dce946ec/22606694630.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/b9652a2f3bc9fb532dfa87e0ac32ecc2/loxedalutubax.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/8f421e3d30bc6e3c556343e8086ec15b/fevokuwoba.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f480a64866---lovumefogodoko.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d245d3eaeca---girom.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/14626190749.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609063bf4578b---vefozu.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/25010763153.pdfIn PDF document text
    • https://rosycaffe.com/file/pisuxegamewiwulodutifofad.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/71848215782.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/2970581894.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952fa682f00---80430546769.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/f80cec0508208093c9c8a9ec566f1e59/44162088283.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/16287968393fd027c6eba6b8f494d2.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/94779412375.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/95225157875.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/2f9def86a0f2b479dfe4c2dc5a01b32d/nikiwawajod.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/43467775213.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/xozureworowaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=full+form+of+all+computer+related+words+pdfPDF 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_off0000d8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B6 18436 bytes
SHA-256: caf804dab717e6d7f9fc9a1a19ad7b07f84bbfd19f191b9ecd856bcceab1457c
font_01_sfnt_off00010820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10820 10748 bytes
SHA-256: 362cb69d35e3e7c829daed2be9585fb468adcc12f7f1f5af82a3c71307ec36b7
font_02_sfnt_off000120fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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