Malicious PDF — malware analysis report

Static analysis result for SHA-256 d07fb490332ec605…

MALICIOUS

PDF

79.6 KB Created: 2021-09-01 09:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 075913b5c621d97ddad33493b8a1b3b6 SHA-1: f31019d4abbe32fd31cd295510468c6da403b8ba SHA-256: d07fb490332ec605ad78ce57cf08b31fd1a092d89e95138f9d345ac7c3a42a2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the extensive link farm is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nomylo.ru/uplcv?utm_term=sweden+famous+for PDF link annotation
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d881b1a36d6---xumapikigavutetadut.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/bokakisubotakatoveniguz.pdfIn PDF document text
    • http://bloomlight.pl/_bloom/file/nokazetikisusipo.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac27037e17b---kepub.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/tni77im48bma79nn5ghjdha1fr/loletomunejugebi.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/27006956746.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/ffa9a21cf47b6e6365f2cc94d3b3f54b/62207408574.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/kumofavutaxutotefusuw.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/892a92a2322ee5b98e2889550178c7e5/42884955142.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210727_57E5C40E031012B7.pdfIn PDF document text
    • https://foulardfotografando.it/file/99713078882.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bd11d56b2---jilinuwuxotenik.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/f4bf88fd64cf87913ce72b26088d7e55/3894340149.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb29e09ff8---nuzavoxo.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/98280874270.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/90215078490.pdfIn PDF document text
    • http://liyangah.com/Upload/file/28379382901.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71c5547821---84810204343.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/lakikemez.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/fekepimiv.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098a75f6318c---84007341843.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/56530771963.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_off0000cfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEF 18380 bytes
SHA-256: 1755b4014dd133db74ecd93a877f79a0e03f37514a06088ff6d690965427b43c
font_01_sfnt_off0001005c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005C 10540 bytes
SHA-256: 365032ec9b7e32cb21b496c5d12a35f8ed89e34874ce05485decf3cb21932981
font_02_sfnt_off0001186f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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