Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab78615016d59f4f…

MALICIOUS

PDF

87.8 KB Created: 2021-07-13 22:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cc3a4badd98ad488700b488142fbb509 SHA-1: 9398f2e9814e92372b133a4df5ef803dbf6b9f56 SHA-256: ab78615016d59f4f7abb4ad7cb3d746d7be59880fa3a08108ffac784e0fa9e74
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress installations and other potentially untrusted hosting. The primary purpose appears to be directing users to external, potentially malicious content, rather than containing a direct exploit within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/941d597f89dd865a4bff85ee5567780b/sabuzamotu.pdf In PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d85033ead6---17383493357.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/62184949764.pdfIn PDF document text
    • http://grabnerestriche.at/tareboluvavaweru.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/vafawulosajeguj.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdb79ed8d6---libegulikod.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ba79e59ef0bf0fe166396335a4a984a0/82257855187.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/86090812566.pdfIn PDF document text
    • http://hodori247.com/uploads/files/30789440856.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/mcaiblntgg5vfc6q6bfjoun3ql/nekosote.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecf798dab0---82962986.pdfPDF link annotation
    • http://kahounova.cz/userfiles/file/62287989383.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/fc0b732d5d51269decbe3d7453819edc/25986313671.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/leraniv.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/38103371032.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e287891f5---gamixoweti.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/10229947502.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080287a28248---texuvivu.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/46105379578.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-1/20210501234806850375.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/5671cn2uj43t95bfpojk7edubj/fabewoverunazabitujudupo.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d428bec09---pojuf.pdfIn PDF document text
    • http://reunionfamily.com/clients/6/6c/6c58f7de0247188f02debbcda007d80b/File/86991301316.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073f4fc47ad6---42882844625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=journal+of+philosophy+of+education+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10406 10920 bytes
SHA-256: 47ed9e642976379feaaf2639ddc4d0bce6be300a5d41945e52ae42cf72e9eab9
font_02_sfnt_off00011d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D43 17096 bytes
SHA-256: 5e07a0efbfec50731fda1f2378f0c5f0fdcb1700521acd9296107a93be0d4b26
font_03_sfnt_off0001495a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1495A 1672 bytes
SHA-256: f384ffae16527fbd16d201c5b47ffe8093d02a71285092337729a64ba3d11244

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