Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcbb3f8f9d2b2868…

MALICIOUS

PDF

84.6 KB Created: 2021-09-03 07:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 074bcc2bb8741b91a421df793e269e34 SHA-1: 4495298b65ae84c28e761355cb9d445861e9a6f6 SHA-256: bcbb3f8f9d2b28681c8d84cfdc4097b21ef3081307fbd08eddfb8a56efee5983
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, a common tactic for hosting malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The file's structure as a link farm suggests it's designed to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1ac3b6e89---bolusoradejorukugenozos.pdf In PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a18991d5955---57569845044.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160759baca6bc1---pasafesisaw.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/79641105452.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/57590570046.pdfIn PDF document text
    • https://lukili.ch/UserFiles/files/korubiniset.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/kutomigepelogafumosonu.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b93f4441f7---32467450513.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/34432535903.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/16a3de30e0aa1b63f2dfc916045f1336/lubavixitipejufatuloseg.pdfIn PDF document text
    • http://viorina-deko.com/images/file/nesujakofeji.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7bd115296---66154612966.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/wogabixuj.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/jarebaximibowa.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/27656231593.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/5o0eedma2mkn7spvlm1fknqth7/sokelilukiwopusad.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/arnosdi481cmuqhepbv5j14i7n/mapetabapepagokox.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/46922439597.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c183d290ebc---28976773907.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/926bdca1af99ea02efc3aee39713238c/1751025103.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e04e50020d---wawanejagunakikibepizow.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/mezerukifedosadizop.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/sorixejexepozetore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=peugeot+partner+workshop+manual+free+download+pdfPDF 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_off0000e38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA3 11132 bytes
SHA-256: 3417431bf2e80d06bd925036b59d631269daa5351ae1c054e7a1d2e36db503b6
font_02_sfnt_off00011556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11556 17984 bytes
SHA-256: c65c45d1568e8dd44b5f02583f702a7d9158533628ccf260d5e5e617bb8b3fb2

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