Malicious PDF — malware analysis report

Static analysis result for SHA-256 019c418edbf89964…

MALICIOUS

PDF

112.2 KB Created: 2021-07-02 09:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b3f0545d250a81a7b8b15cc1c889c06b SHA-1: 6274bb27f845d4997774a9b87b98b24c70de963b SHA-256: 019c418edbf89964fab0fbfc7447c90d181e788f3e9e5c11c8aa3776f13a9572
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs pointing to compromised CMS uploads, indicating an attempt to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/cd0du6chit4agc7ga7elb807rp/82854545855.pdf In PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/9734810845.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc69d1ae70---92131705050.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/diviwigixujuv.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/ab1f4ab68a88dfe177da431e68e9d617/mupidogijijetokoja.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16098edb25f217---dusarelufefib.pdfIn PDF document text
    • http://ibiforstarlight.ca/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/lupobolefabowuwez.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090c3cb1665b---49242662975.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/metixamuk.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ad0425e7b---32431310577.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/82562530758.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/0rqh1cai8cki4sd3lvpq6its80/mowufobil.pdfIn PDF document text
    • http://dalaichau.com/files/11522644186.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/dokag.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/sogomaboberovokebo.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa3a8e380d---15252318781.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/7774836738.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/qkedhkrp558lpdg9grul01obh0/menonafava.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/peluzovafalubexatupabumi.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/741cc8656605567343411f6212b42b2b/leparizopub.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/d2fbcb9db362afe20c6a6b9d84f2a296/wizusowam.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc7b4441269---60878218696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=netter%27s+neuroscience+coloring+book+pdf+downloadPDF 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_off00014ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA5 21012 bytes
SHA-256: de9398e1e9c314ebdc4734c371f7e8d4eb2f63727077b3c3b96f507700e30321
font_01_sfnt_off00018103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18103 11224 bytes
SHA-256: 35a76f9f40536a3934ab25bced899007044fdd703c60e83e1f507fd0347c347e
font_02_sfnt_off00019b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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