Malicious PDF — malware analysis report

Static analysis result for SHA-256 809b3fb3f5a23da0…

MALICIOUS

PDF

88.8 KB Created: 2021-08-16 20:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5a8c7ded70e469d7abb378946ff9e139 SHA-1: 8da9acda9688ee5bba1f4e0b51bc72051c6cd52f SHA-256: 809b3fb3f5a23da0920eb3e04380a3cc969c945ccdf7e76ba44d333c14cc964d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://laborke.ru/uplcv?utm_term=what+are+the+various+types+of+alcoholic+beverages PDF link annotation
    • http://allprintusa.com/admin/images/file/79301201731.pdfIn PDF document text
    • http://cppzone.ru/users//blogs/file/pigos.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/putoporakubalitefit.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/tufuvafesoduli.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/3617077214.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/rilanamulitajisa.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/bijamozi.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160828882afbd9---70251818829.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160749fa2dac6a---73997417594.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/wizurapojutofupepe.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/vivewamimodenijiro.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/6qqe6nncvgro48eotjkj492r94/potut.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/debeseditunudirami.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/46306922865.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/82573544756.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/38059269264.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c5f7b7b66---wamilejagukogax.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/f4288c78b60b1efce92d98a1df955034/mupiwif.pdfIn PDF document text
    • http://drhkltd.com/upload/sawotolebupatemerudilogu.pdfIn PDF document text
    • https://businesslife.com/content/file/moxobemerozuroduvurepumum.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/94636622377.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2f5172903---vafupepofapuxokewotatubu.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_off0000f330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF330 18420 bytes
SHA-256: c0eed8e421b852c20b4039f51dae1db7f91839ec2037c8ed3eff49f727549ec8
font_01_sfnt_off000122ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AD 11068 bytes
SHA-256: 416d62b0504e50efa2c649499e63d9ed66ed00097aabbccc4e67c87a06a4dca6
font_02_sfnt_off00013c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1