Malicious PDF — malware analysis report

Static analysis result for SHA-256 91636ca5764f2b31…

MALICIOUS

PDF

124.5 KB Created: 2021-06-26 22:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 048c20d264c1b8d3f25213be52cad793 SHA-1: c9432c6a6f267e6c3b0e8a8583ee3aa19848da73 SHA-256: 91636ca5764f2b31ced9c2c2b0265384b1cec0f7310cbe246ba6df98f5628c4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for phishing or malware. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9809

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://wastran.ru/uplcv?utm_term=small+blue+and+grey+bird PDF link annotation
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a380523cf---3861888671.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096005bdee36---88588528260.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098475d66c3c---sepulafipikunojigememix.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/gudadovijum.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160adfdb7f01d3---xipiwisujotetedoke.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/zoxonubexukafarujamakema.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f27c6082ac---xazexojiwuku.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075bd9879c63---lujuvidab.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/26147543703.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/q3n4judeh6lolv01vhcfjpc7l0/53790221140.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/ranuwewebowinuxogigo.pdfIn PDF document text
    • http://soles2walk.cz/data/file/60161784268.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/55231940301.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/rf7ir3ttvpjf2ck8f75tokhl16/xozuzanotusasotu.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed7a688d6c---sotepugazuxesorofab.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/qg47fg5lg31ebr2fhbq7eoia40/59267394122.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/31295379697.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/kibomozulusinijovabi.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/zawofafe.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/53500821825.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/3f1fdc814958cd4c69fb022c2c184430/nizuzenadiga.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/bec444ddd7c309e1c7b84b8285f111ca/31189823263.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609087aedfd22---79809871986.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/sevafagamekofame.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606efbfb3576c---45454835128.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/593848e6b486419bf2bd54969b73cfa1/69901047175.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_off00018689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18689 17656 bytes
SHA-256: ee02ba2514ebaeaa08baae06d698dcfead1333dd7bca0168c57639d4f5abb6da
font_01_sfnt_off0001b484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B484 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001cc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC9B 10632 bytes
SHA-256: 472a9eb1d4611d434b94ed704d2725ed8931837cd57ffa8eac4f80a11b04e173

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