Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f6798b95055ca5…

MALICIOUS

PDF

128.2 KB Created: 2021-09-15 09:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a2738b87ca36aa0fc075c968f018d615 SHA-1: 7152de3dc1a747e15d72af7c0e72078fd0bc2637 SHA-256: 57f6798b95055ca5c772b2ae2af23037c48e7eccf0e511555389003998ab0d92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, but the PDF structure itself is used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://minipowerpack.net/upload/files/23608109330.pdf In PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee1928b62a---60396909923.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/zorewiwukizuxamuvegekuv.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/85667332718.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/nakawodege.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/83684896099.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/mevajatagijizovonavex.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/92882302327.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/luwuve.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/24976410618.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/vuvokazadudabekafudikux.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/86759429503.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/94705681189.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346013173f7---66612454253.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/zalavaxaw.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/doxupaveduduz.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/jukesavexadukiri.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/kikivufejuban.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/risavuvaxoraku.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161414224891ea---lafukorumajepakowunovu.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/36652965834.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/23824272992.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9d1b44306---11026117259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=hatha+yoga+pradipika+book+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_off00018749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18749 10664 bytes
SHA-256: b4015ec3921e98a4ad852e0ec81a1c2ca99cc164110d204b56aa4ae078021c07
font_01_sfnt_off00019f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F64 23580 bytes
SHA-256: 8cb67ce310fac7383998c0b7425553f63b2f65f74bbc897cefebfdbd0ce0c391
font_02_sfnt_off0001db1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1