Malicious PDF — malware analysis report

Static analysis result for SHA-256 285102d4ec14059a…

MALICIOUS

PDF

71.8 KB Created: 2021-10-03 15:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04fc62e388403499806293b979f90d26 SHA-1: 620ed7753c6578764d5f54dc582881ab73fb16a3 SHA-256: 285102d4ec14059a568eeef3652d5bdc3e0ecd62878dfe24d82b235cf587aed0
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The numerous external URIs, many pointing to compromised or disposable hosting, strongly suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=long+form+periodic+table+pdf
    • https://arbormaster.us/uploads/files/xopuwajusadokinudomo.pdf
    • http://www.huntsvillepr.com/files/files/nojajeriwudukizepegifox.pdf
    • http://alisawedding.com/upload/users/files/fulurujara.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153624959f0c---51679969405.pdf
    • http://proartgaleria.hu/files/files/tezevonebajenujolot.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/c5ebf6e5e9aca4db10f7811b557fbaea/51369920110.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/wajazuparovanik.pdf
    • https://milorem-service.ru/userfiles/file/72897460685.pdf
    • http://thamcohoaian.com/webroot/img/files/33500759596.pdf
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/jadujisuvuvogom.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9d03e6921---94570915936.pdf
    • http://dspec-car.com/js/upload/files/2187486227.pdf
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/woxupezojozatexeni.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/4f9eb803d69efd175e2d29ea18465cba/vojegubulebuposi.pdf
    • http://manisafar.com/basefile/marcosafarir/files/53168841920.pdf
    • https://wolfgang-photography.com/userfiles/files/66550462317.pdf
    • http://hiace-yoshikawa.com/js/upload/files/gulapigekufojo.pdf
    • http://daiichibus.vn/uploads/news_file/derizemosus.pdf
    • http://marjoleintje.nl/include/userfiles/55499413057.pdf
    • http://manuale.aziendasulweb.it/userfiles/files/badalemejif.pdf
    • http://minerva-collection.net/files/files/68247262996.pdf
    • http://czerwoneiczarne.pl/files/file/wafasu.pdf
    • http://guides2alpes.org/uploads/file/90510467368.pdf
    • http://akkoryazilim.com/userfiles/file/6896918289.pdf
    • http://gazduire-domeniu.com/UserFiles/file/6787912625.pdf
    • http://rjbmachinery.com/d/files/87921603505.pdf
    • http://bibliotekaszamocin.pl/img/upload/files/39389958301.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C0 16792 bytes
font_01_sfnt_off0000ced2.bin
d3e0b80c6493d695f3fb198fdf2aa53dd24ba76df18d9692d461347075142007
pdf-font-stream PDF embedded font (sfnt) at offset 0xCED2 16388 bytes
font_02_sfnt_off0000f88e.bin
294def7992b74d66d546bdfe175d05f211be6f03fee98cad2d93279622626c08
pdf-font-stream PDF embedded font (sfnt) at offset 0xF88E 10892 bytes