Malicious PDF — malware analysis report

Static analysis result for SHA-256 867c4be4679344e9…

MALICIOUS

PDF

84.5 KB Created: 2021-09-20 02:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e33cdb808cee0005e45f94b4b043ba67 SHA-1: 1302c8c73aefd45d3343b62e8d4da6ca5c9c7cad SHA-256: 867c4be4679344e99909b2e26386fbde2d083f45d4dfd2d2193a850f525586fe
176 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload storage, indicative of a link farm or phishing lure. The 'SE_CALLBACK_LURE' heuristic suggests a potential callback phishing or tech-support scam pattern. ClamAV detection and ML classification strongly indicate malicious intent, likely related to distributing further payloads or leading users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://moneymaker-gold.de/files/bupebevomaxurufoto.pdf In PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/jimap.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/24633051586.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/17985161594.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///jotuzupamuwarok.pdfIn PDF document text
    • http://becucci.it/userfiles/files/54918545905.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/86406156013.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/407699002.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/63031537378.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/9599610179.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/15913297929.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/81084688841.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/r3s0ppthb6h9jd3n5nhcvsq782/sebavo.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/56202749525.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca84b93c42---zelanugu.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137b4edd2945---lapobisapevurosegawatin.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/zaxavaki.pdfIn PDF document text
    • https://seikai.jp/free_images/files/92588572981.pdfIn PDF document text
    • http://fourfoods.com/images/files/baxezukupesusun.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/finevulefolubivemilufu.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/luwosapekolojipomoxopakel.pdfIn PDF document text
    • http://hhsmelt.com/upload/files/83564844622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=mp4+to+mp3+androidPDF 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_off0000e61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61F 10452 bytes
SHA-256: e63d7604b69673dc3edc02a04471c8383a5e4f2e5b2a20ea0741680653fa9495
font_01_sfnt_off0000fdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E2 17912 bytes
SHA-256: 03c82ff705e9412109d87c2cdd7e348012cad23f5acb8b17dabcae73f5106be1