Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2485557647fd5c2…

MALICIOUS

PDF

88.5 KB Created: 2021-08-16 06:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 71076aaaf7f055baa970986bcbe1275c SHA-1: 8b00820b3538b1156fd891cad4efc40d1d915fba SHA-256: b2485557647fd5c29c986173a83708a2946cce37396ef8221eec4a9a65107f37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/9855ad1907123b1fc87e697abf251f74/lonepopunisebitiwagur.pdf In PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1ec55e48a---19034269422.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/48d0cd6c83696081ecac1a609447ea32/91567854139.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1626720350.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/17064449647.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/85591156200.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e7e2d2d09---lumuj.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/tavoz.pdfIn PDF document text
    • http://goodmix-psc.com/userfiles/files/jugenavemodisas.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/vpq803r7hcernfm2je72usvdm1/zizepi.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/a485cd723a289f29ebff8a92d1b4a217/zaretid.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/18680640006.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/55425392867.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/rivibetagobopokuvuvap.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/a16e804de6a29006e3fe6f990daee870/wabifepixesedokutiloma.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/5bkoh56u70neat0ggvrt5a6510/53816726310.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0702e4a87---68548973368.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/5e6d2006d7da5dee14c748fb8eb92f17/82060999137.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/75127759721.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/zuzuzesifugifimefefog.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/65938509640.pdfIn PDF document text
    • http://devison-matras.com/upload/file/78392607594.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/5d47b325b5c5103250fb83b8ba9dc19b/96968812280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+do+an+infinity+sign+on+a+macPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA43 10732 bytes
SHA-256: f0d123cf8b9118645a48cfefeb7191b32a39dc12798d57e8c58263c8a011d78a
font_01_sfnt_off0000f2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 16324 bytes
SHA-256: 0ca7f33d6eab45fac5b8aaa06550378dc2ad130fe9aa33f2c93ac02ca5970b46
font_02_sfnt_off00010904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10904 18544 bytes
SHA-256: efeb7a9785007363e93a270689936a904d2a997a8f0843ebc61bc4c3371f4cea
font_03_sfnt_off00013a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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