Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed39d499246ad38f…

MALICIOUS

PDF

92.6 KB Created: 2021-07-03 05:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5b1ec2b48e412e4a6e5dc9a9d6968150 SHA-1: 12f91ec6087812f6db9571b3c63b801a74103113 SHA-256: ed39d499246ad38f9d88991669b06455f82f1d6f90982720f5ee1833a8b45f48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites hosting further PDF files. This structure suggests a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a20e7b2195---92988784061.pdf In PDF document text
    • http://dkmmotor.com/files/userfiles/file/semizarij.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/h4k1g478ur85328oc4vi1cs120/50087727132.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd507de1ab0---8096321267.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/11728763066.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/numufidejakavufumebopop.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/xiwikijusarujuzopizi.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/eokhn23s7s59kri42m9k61qcjq/74643978397.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16086e12108c6c---lapede.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607666247d768---biwujuketovoliweviwez.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/f2930307c023f30e54d44875fbd5ae78/xifividujegukenalitazu.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/44172825031.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/nuliw.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/492faa8a87c9b180392016ecfb7da971/gakosu.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a85c352bc---gukokobidotibuzu.pdfIn PDF document text
    • https://arerp.kr/data/file///18315925368.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bda4a57bf5---5045843839.pdfIn PDF document text
    • http://bostonmentors.com/userfiles/file/33126333927.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/29a8e3dd230880f1db694682d82430ba/zivivafofikesaxave.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd06551dce2---57592654256.pdfIn PDF document text
    • http://sparkpro.lv/content/file/96117479747.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/89b69f9c15f648e9c0cbd26c3fb2cbd4/devebijivazifuxepamubid.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160943f7847af3---bogevogiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+pray+for+a+friendPDF 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_off000108ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E1 10468 bytes
SHA-256: 4b56898f04765528f7d918b6613e3285657f8051c7407a574367b59d732cc40e
font_02_sfnt_off000138c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C8 17116 bytes
SHA-256: 4d2b28cbcdbd31a19e3e07ae592ab87a9fe87a6f6a01e5b0ef7032d306c0fa2e