Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea4d0d94694c5379…

MALICIOUS

PDF

83.2 KB Created: 2021-09-05 08:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 5123c2b4e2e6644084a5d7217080e426 SHA-1: eaf7847181dd4e647a66c461d2b7d34ccd981150 SHA-256: ea4d0d94694c5379ec4a3a258735a0aece7cd109dcb7527b74066efc9d78a3e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to facilitate access to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1739ccabbe---goxaxamarojivesa.pdf In PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/pikoxuwefovake.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/57390085544.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16103b90c496c6---71296332064.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/xagivakewirerego.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160def990d100b---7045036341.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/xuvosiponelofeg.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/68768004878.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607499501473d---99802141948.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81c01df34---79244153368.pdfIn PDF document text
    • https://chp-travel.ir/data/file/74365807442.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/56c2762a1a700ccc3da6c97fbd5a5c23/zarogugipusoxusip.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160728c2f304a0---jediwojinowe.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/4317319134.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/93097534669.pdfIn PDF document text
    • http://sapaethnic.com/webroot/img/files/mawanewodemogomorule.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/jozogamajolifeler.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/rapuv.pdfIn PDF document text
    • https://jurad.eu/files/file/simave.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/kaxexeruzitafuminemexow.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/befarivuwolu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115e45e462b6---jilapopujufam.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/ripovonogisedenurek.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/5706ea85b9e1b2e87af753dadeee0daa/1178390320.pdfIn PDF document text
    • http://plastikacz.cz/soubory/files/manadonotugom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=naskah+uud+1945+setelah+amandemen+pdfPDF 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_off0000e248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE248 11052 bytes
SHA-256: 39a0eb62bdf921faa067ba1372105cf30e1e3fb0353d984507d8ff28da6d897b
font_01_sfnt_off0000fbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001140c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140C 16408 bytes
SHA-256: 1de2274571089cf3de3e8c83a0bcb2bfb2582847e0258fa34f4adcbef3b7659a