Malicious PDF — malware analysis report

Static analysis result for SHA-256 d521fb607b5aa79d…

MALICIOUS

PDF

72.5 KB Created: 2021-09-06 02:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 88558c3245410ccbec2985f5104dfe08 SHA-1: 977295dac3b2cdb0a7ebf7470a1eba88a0d52cdf SHA-256: d521fb607b5aa79d12c1d25427408ee88533a55e90c4719ee877c19e0252edad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. These links likely serve to distribute further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/6782c9aece0d5d85e72011cbe7be6ea9/10531345348.pdf In PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/43601999461.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/34200549a67004c4e1bd4a52b1ef4e6b/pozogezekuva.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/m274i46ncodsor47840anffq22/vowujepuwu.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/zujivutab.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d17c2b2e09---53421405156.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bd9d65035---62416134608.pdfIn PDF document text
    • http://ezibra.pl/upload//file/9979920910.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/fozuregotifopowajip.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/79985129942.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606edbf92b707---nixikisaxeki.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a554b87fea8---wewaw.pdfIn PDF document text
    • http://sun-eko.eu/files/file/65749546476.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/54656984677.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021081117564073499.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079eb8f5a98e---25267749862.pdfIn PDF document text
    • https://bliznacite.com/files/6451354672.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/65763618275.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210819_586AC736F39F10A8.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4de00857ff---zunumagokobinokumave.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5903d1a7c6---42533615550.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/zowusenofava.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/k03i9dshe4o97ptdko2vr4hfq4/dobafanuga.pdfIn PDF document text
    • http://join-angel.com/ckfinder/userfiles/files/16116851282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=manualidades+con+palitos+de+paleta+de+coloresPDF 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_off0000b975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB975 16256 bytes
SHA-256: 0cf776ae0176c49038fba99d62cf2ecf5ebead2dff9406171f91f29ec4dd068e
font_01_sfnt_off0000e236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE236 10600 bytes
SHA-256: 68e65c2dc3c29d2ac00370fe5857090e6e4c4c8b3d68f00e59869be361db7778
font_02_sfnt_off0000fa81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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