Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e8b6edd67fcab6…

MALICIOUS

PDF

67.7 KB Created: 2021-09-26 10:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b891ae562b35ce51e6d8733400079b48 SHA-1: 01cd2d50ee3da840ec7192ade73ed876209f268c SHA-256: 91e8b6edd67fcab61420373ebca85600bf936d4ad347522a171d38a16275c218
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, characteristic of a link farm used for phishing or malware distribution. Heuristics indicate a high likelihood of malicious intent, with ClamAV specifically flagging it as a phishing trojan. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://ever-progress.dacola.com/upload/files/dewaladumujunebamepixexa.pdf In PDF document text
    • https://zakarpattya-tour.com/upload/rekiziwumekim.pdfIn PDF document text
    • http://maulich.vn/attachment/files/29563037439.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/roninapapojubamuruz.pdfIn PDF document text
    • http://christopherdallo.com/file/48190532577.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/gogekemol.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/94764258351.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/zaromuvufiferepaxovo.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/903f23c032e540071098870c2d5ddd9b/lujidiniwam.pdfIn PDF document text
    • https://tarsiman.ee/files/file/48831913099.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/4179a1c25b2579739942bb756e57b6fe/76159573448.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/19562465526.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614cccb7a558e---dujafuvubezorogidav.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/28987678198.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/37995318684.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/tesanugor.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/razozimarisumamejumepuw.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/puvawuzi.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/67701270790.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/fd28a3fb38be404b2eeedc8774227333/53083135257.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/79547080714.pdfIn PDF document text
    • https://akemi.ro/hirek/file/ditodarudupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=carrom+pool+apk+mod+downloadPDF 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_off0000adc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADC7 14552 bytes
SHA-256: 30a25187969e6c425344b1c9e4f738609ad65639a4fc03642955dbd4bfe303e6
font_01_sfnt_off0000d252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD252 10272 bytes
SHA-256: 777e9b2517fef9b333fb656c5d7f32729566ad2c99e04a2911892e603cce1fa6
font_02_sfnt_off0000e963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE963 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1