Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3cbe6de17fbc27…

MALICIOUS

PDF

95.1 KB Created: 2021-08-10 07:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 541662b33c1b1b03712fa362e792bac8 SHA-1: 4b6f1909e72918bedfd424fbace81d11a6fd8847 SHA-256: cb3cbe6de17fbc27de723aa1006b289dc219ffab9fbd8ba2189afdb140ef039a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress uploads, suggesting it functions as a link farm or redirects users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://laborke.ru/uplcv?utm_term=exercice+de+svt+3%C3%A8me+ann%C3%A9e+coll%C3%A8ge+en+fran%C3%A7ais+avec+correction PDF link annotation
    • http://vankouwenenmastop.nl/UserFiles/file/16963043816.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5075e43d0---84208429812.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/7382495187.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/rivosemodoxosevosupapude.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f18501dd29---49285242042.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/e39436cd8a6dcfbffa987667cd0e2767/pebiz.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/68665305158.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aafcff1167---39833952157.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/2135529646.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/41289626602.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/31682067915.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/9e1528e84585bd9f750d24bcfb480b86/netidejutizawelafo.pdfIn PDF document text
    • http://nature-revive.org/files/file/vibebave.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608746d70849f---fabipimilikotov.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16086cc5055cce---fafifekuvasijuribij.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f989fbe15db---medinodirelulusefaginolel.pdfIn PDF document text
    • http://stonebreaker.at/wanazunezemaputolowuz.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/141000404305.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/13559717164.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160867517c90b5---43165409095.pdfIn PDF document text
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/magezelotetolevewugaju.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/digixezokabipixudipebig.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/vafumofiresobibux.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_off000103df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF6 11648 bytes
SHA-256: 618e25767fc21815168ecc6f23a3589d71dacde6b3187ebeef200f92f635b34a
font_02_sfnt_off0001368f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368F 20328 bytes
SHA-256: e9374c85481c53bb130f2386c56f33078ad5e2075927f051682154618a18bb97

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