Malicious PDF — malware analysis report

Static analysis result for SHA-256 a187b4909edd6611…

MALICIOUS

PDF

84.2 KB Created: 2021-09-02 02:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 042002ed0b487ea017282fa2b08c11be SHA-1: 58b8d08133a3c25fcb2c65f13716a77177f54748 SHA-256: a187b4909edd66114c4b71ccbbaf9a7ce8dd4ae8fce4de13c6d486c84525f219
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for further payload delivery or phishing. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://qqhanoman.com/contents//files/22578343596.pdf In PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820df3d6e05---96248650911.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/8991536208.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/zuvezixanekofefedoduv.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cab30f29809---worigusijin.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076b62f5661e---wolowuvudonuxub.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/11225368904.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/n43423q93dekfccromiu2csoir/lamugelilogibisufowibiv.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/5cenbetc6v3nobtnr90a7ispmt/vokakeveliliregiguxijavi.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/pefawe.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/rexawa.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/74da2f1a9da1f83c7b69b04af46b6d68/raganajisegawebozo.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702e59ba57a---65489708631.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/8bf73187f30d41af4125e3dd8f89e3a3/bifibuwijopugemoxof.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/949109664.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/30205890810.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/dodajetarisolupumibutubo.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6768505a1---95891123092.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/a7167862eae965c44975df7674118114/15555666343.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/jakepus.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/vokolanu.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/u5rn71b3p68dk8i96013fd9ngu/16560023811.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/c6d10b7aa6331eadf88d9cf4c9422621/nibetuzitexab.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c68117629b---sidalofekevogezapip.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/39921617795.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/c589e1a52b2043b5148af5a67bc7d95c/12095842779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+positive+school+of+criminology+was+founded+byPDF 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_off0000dff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF4 11536 bytes
SHA-256: 79c0ed3b48487ee33e5b5e443ef81236df930f382c01edef1dfdeb6b42ab1bc7
font_01_sfnt_off0000fad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E2 18480 bytes
SHA-256: c32fd80c642319d77cb4cef5c63bdd4231266e657f782e74d5fdf361be4b387c

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