Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4a626e2bc108ce…

MALICIOUS

PDF

79.7 KB Created: 2021-07-08 07:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c08e6c6820c995674e6a58ae47ce13b8 SHA-1: 4cd3df09416b5cb52b2d5654ba4183541e316b65 SHA-256: 3f4a626e2bc108ce4aadfdab4ded9eeeedaa3558b2604fcb755b86fe094c6c56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://maxidmum.com/images/upload/fck/file/93975410059.pdf In PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/8359c266835dae78c3a215c63f000866/59723997490.pdfIn PDF document text
    • http://edison76.com/clients/5/54/54c13950cbd15a81e6fb4362eab8f273/File/23789696067.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/buxuvoguwunurenozejivez.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/dec8fb84e1e4f5f098304f93335421db/beruk.pdfIn PDF document text
    • http://schokozentrale.de/idata/xelomunotum.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/32964560050.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/kodavejimexigi.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805d4d1c60d---61786173056.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ea24c7f17---koseg.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608391406b9ca---28645405435.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609324ecb29fe---84366170448.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/mezonawanugigerekafex.pdfIn PDF document text
    • https://2acontractor.it/images/file/52756463626.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4d1c24de1---75575027371.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/1e41ce3da8cee3f4def610978ac818c8/93847852371.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e382a111e3---wubuxinabi.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/solisodinebu.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/g77jvt34tj9ddhj1lr6n96raba/jipikonik.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/55a756fbda6ccb6b0eb0aed236e57b4f/tiwukojekuzidowusevasupon.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/10479598367.pdfIn PDF document text
    • https://datawire.gr/files/files/64141984962.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/21247306007.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f05e01a80d---89055610952.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/45b887d35b7b0b6eb8206cec375d3a7a/47849238560.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=unit+7+polygons+and+quadrilaterals+homework+1+angles+of+polygons+answer+keyPDF 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_off0000cd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD03 11592 bytes
SHA-256: a5b3eb276bd74eca482b0fb784db9437b008bf3ce3731ffcf0d91ad95f07ed74
font_01_sfnt_off0000e80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10021 17824 bytes
SHA-256: fd87ec30b1ca0ce2c359c87d7b24c4dcd0a5cf29c93dc4f7d0d90389fe652303

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