Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd6dee625f819ac…

MALICIOUS

PDF

80.1 KB Created: 2021-08-10 04:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9e505e324707df53ec75cbe2b1010a0b SHA-1: 8016adda868d9fdbcece3753e9de07b03b02a273 SHA-256: 6fd6dee625f819accbfebe08957e88faa76a75227b2a6e812db440b393cbbdfb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4849fa0dc1c2c786002a0e222b6b276b/82133386650.pdf In PDF document text
    • https://stvorki.ru/files/file/muriwovegidiwozuroned.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/121cf2a23a3eecf0addb8537e2197830/8855606552.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/73699534481.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/losugokixinu.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/33625482687.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ca509d5a5---puvenu.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607576254ff26---xabokisiv.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d387ebd34---kinefi.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/zovukowakuvorodekadeve.pdfIn PDF document text
    • http://hyderabadibiryanicorner.com/admin/images/file/kunupuv.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/26169029601.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/47571882193.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c74c0cd63---letuzisa.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/4ff39805f260442833ba4c7d63532ed3/16546936934.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817c4ba7985---vusopufe.pdfIn PDF document text
    • http://primaneighbors.com/userimages/48839382869.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/popikajife.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/131e169c69929ea7aebc8917d4c819f3/fawizewevupijuzogojejale.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8daa6a22d---zamulilivamuv.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/xesegemifikadetovanadu.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/misadagabetolij.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/25434977546.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/96331625397.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zotavor.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/dupatuzanorojarazalisif.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ckn406e9063hq2uagl4ntvnv8r/fibojofugizilem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=niagara+launcher+pro+apk+0.32.4.1PDF 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_off0000d3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DF 11168 bytes
SHA-256: 065f4f3d7b85a7a7e4830cbaebc350e7a00bfaf97c1559c2517e6b699612749d
font_01_sfnt_off0000edf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF6 17200 bytes
SHA-256: 7f5e789ce4093b7e58ad267b5d6c124699f1180ae1cf3fdcedd00e4f2de196d3
font_02_sfnt_off000119cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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