Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b58f9b0428a3acb…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 06:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 609d510eb5e93ca05188ebe5d5bacb16 SHA-1: dd70229e4e1c67f0ca80ed433bd4a4f5a44ca21b SHA-256: 8b58f9b0428a3acb474f78a0f39f25123657a8ddd4799f10a8d2a6ed0478cb3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=multiplication+tables+1+to+10+worksheets PDF link annotation
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9435cb8ab---693488081.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/54356537590.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/vufoxorinetom.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ef5d1d7f2---poketudejozukikavajezek.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/bevewimugud.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/12532617625.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/h1rgk0osfhiup241uh2tvamhu7/jukuwobalesupaz.pdfIn PDF document text
    • http://odumakus.com/uploads/files/13824696314.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/603aad2eef2fe2195bef77f2b56c6371/tisenifemewe.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/63048160088.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/17975103598.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b6177caf8---juduxovesuxozagov.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/kojuporafobol.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/revefiverujifajukesewo.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/78911249467.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b53b36fa8---rezosodexeligoxo.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/benota.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/gumixuluziwifejimonirut.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/zefetijafologipamupikeke.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/6490ca4a06a88bf133654d7685686fa6/12352091878.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d3a0bd6c4---sesonato.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/84ddlu82mfleji8lih9oabn0b7/fitawonuwigulelofe.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bdokmdelhl2s1h9sokfbdndn83/47359942606.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/dibotesaxi.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ba036a6015a---tepejubube.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_off0000dde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE4 11056 bytes
SHA-256: 8e063e9209412000bcb55d7be24463b15b1d7615c5d026d764d58b87571d6905
font_01_sfnt_off0000f77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77E 16760 bytes
SHA-256: 6df1ed6b9d152bdc741174986aad429bec1dbec8872221d096d08d3d92518fd3
font_02_sfnt_off000122c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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