Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87d3f816c567b72…

MALICIOUS

PDF

107.9 KB Created: 2021-08-12 09:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: c86eb86c4c9c28b0c5930e319fe6a3c8 SHA-1: 6feccf1d8434eb8ab22a47a3d47e17fe1d54cce1 SHA-256: a87d3f816c567b7228a6d9339340013f577d1d657bedae593b0d10048b5af91a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/c3f99c094602a7f6b4d5ebddd570f607/wenuserusaxiwalevefivegi.pdf In PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/91630649961.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/57c483691d28e07576d899ff13d55110/22898231178.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/23250983414.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/fanorag.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/vo22m7l74tjaqa2fj2guqec9fe/jobazutabuva.pdfIn PDF document text
    • https://allianztc.ro/files/file/limudibijoratewelafonowe.pdfIn PDF document text
    • https://lesura.net/userfiles/file/pitegufixug.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/kaxabupuwevapip.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f0933d177cf---92449286603.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/45732028830.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/5c0c19ab24f3a2f4257082b331e97623/37886728571.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a70481c039b---74392139325.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/44717574366.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/winejutudelojegapofozo.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/82090444476.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/1bc98c2a03a11dac4b7d3afb470755c5/xapagi.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/selidezuxukijuvipewal.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/59807378900.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/6j8617u4s3vaj16gd1fkm8g0l7/92090637020.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/2aa1028e9c4b45eedac8c82706fe734a/majafomivevorukediti.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16113c67929571---kowofagam.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/58814457955.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/ragilubaw.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d777d8fe---dajogakukujowedivoxovis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=hindi+unseen+passage+for+class+9+mcq+with+answersPDF 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_off00013ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA3 18640 bytes
SHA-256: 3f87fa963b1f0a50a879bf283de3fad2db035a7f47f974db0494625d3203ea73
font_01_sfnt_off00016ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DDB 11556 bytes
SHA-256: df9f1ecab4b6dd14f29a9988f4033403934a3b04d8278fe00f4ac53ff3fde29f
font_02_sfnt_off00018896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18896 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1