Malicious PDF — malware analysis report

Static analysis result for SHA-256 07bcd5eaa7364479…

MALICIOUS

PDF

88.3 KB Created: 2021-07-09 15:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b1a5a50db4996b7c0dc4a448b4cb7147 SHA-1: 5b3d23e73e5ddf5de45522c1dd528503e30c512a SHA-256: 07bcd5eaa7364479a69027414bd97293b578007fa217744321160093c0c4b453
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content or phish users. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://medvor.ru/uplcv?utm_term=girlfriend+falling+out+of+love+with+me PDF link annotation
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/fa150242d502733b6c7daf781eaa468b/10668387168.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/57947425981.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1aa0e7910---sowakikuxoxiwakobibufoto.pdfIn PDF document text
    • https://tavio.ru/files/file/zakakuvokopovidisubo.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/2db9cd44f3a1a16d076132c892483191/15509120747.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072774ac7f8c---35880664061.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/smmoaanbrk9cm3iamltctfb980/rowegafabajegebute.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828ce78a02d---rewed.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d271d791e60---42091029018.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/7520daf63c4f125e26089927252cc081/91970951351.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/19229332858.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/17121040984.pdfIn PDF document text
    • http://alltechsro.cz/files/96056102856.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1f3730cdb---42934771010.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ff42fa404895fffb272435be4c5f3233/gibugagotelarezuluwiri.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/36493864626.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094699123e5d---nejosum.pdfIn PDF document text
    • https://virker-ikke.dk/files/fidogenobababefofeta.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/fogut.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/65722096787.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/et2qosointtuonr1plfmhb3v54/78209487577.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0d6a0a7e1---20519182502.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/55664060643.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_off0000f52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52A 17748 bytes
SHA-256: 087b4015cb2c08161906cdbeeb2f06ff56dafe6e3211cb9b62cf591252850f56
font_01_sfnt_off000122c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C5 10924 bytes
SHA-256: 14ac0764d23b9c26eafd8b711aa1dee7ab440031b4ed51282c2d0aacc649e798
font_02_sfnt_off00013bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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