Malicious PDF — malware analysis report

Static analysis result for SHA-256 0140fb50fcbc1d1b…

MALICIOUS

PDF

90.7 KB Created: 2021-07-25 14:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1a98af57b9dae7088eb4acce4872ab26 SHA-1: 259c6e844fa1841ab36db0392488132bc4b9ebe5 SHA-256: 0140fb50fcbc1d1b1f8276115dabae1dd2b744f0fd738e28ed8b43b650ce4a6d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://majubesar.net/contents//files/dolamunedefiku.pdf In PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/4f92cd99e33edcdb74e6975f3a07e1b7/suvisamiwagixopovuzesu.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/xoruxasalabaxisowug.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/47383584428.pdfIn PDF document text
    • http://placc.info/up_image/1841290073.pdfIn PDF document text
    • http://emeat.ru/var/files/83584815119.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/sawidir.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/8a435d0cccc3bd76edb000ab93770d10/godakumufezipa.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/66f9e1ca9dc28fa8217be2e9b80285e3/pigazutolowo.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/31201067081.pdfIn PDF document text
    • http://lg-palette.com/upload/files/96142253617.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/56052547658.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/410e6bfd4089d3b60f5159bfa002ad7d/paxovibebuzunufarotal.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/meaho66gmkfcebg1fvf5mrfsa6/vowokum.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876e73eac9d---nubejaxenasu.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-1/20210601013035674053.pdfIn PDF document text
    • https://mmszke.hu/files/file/joxofewavuletonofab.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/29267530199.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/fusisunotipupafagetalet.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/4694856687.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c66fbcecf---vudojixuxokaxevax.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9ab4e2368---78550641860.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfdd11ce687---wunegaxarutin.pdfIn PDF document text
    • http://scro.ru/pic/file/wesela.pdfIn PDF document text
    • https://sealskinz.ru/files/file/jopenigufebojogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+pass+assessment+test+for+walmartPDF 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_off0000ff44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF44 17336 bytes
SHA-256: 71251a4aa3289151662a9fa7ae79b2132cd67bcdfb9a2984b0cf356c612109bc
font_01_sfnt_off00012cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC5 10504 bytes
SHA-256: 3362326f45550cbe924a888b203864892c6fe3831a6525264ebe34d80b722f12
font_02_sfnt_off000144ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1