Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d73d0763b854dc9…

MALICIOUS

PDF

82.3 KB Created: 2021-09-08 23:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f399c92199842cf2e6faf982db81610e SHA-1: bed4b5db896c7bed4bfbcd3b3c6897d026fd1c58 SHA-256: 4d73d0763b854dc99f333ecc321110a1d4c43502f282047b0b5cde13976b0c7c
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, several of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://kitpaisal.com/mypicture/file/dotinufenagapulof.pdf In PDF document text
    • http://wsm.hk/images/files/bobisibilupapuruzakotapev.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138eab1945ad---jusurotagibanuxagiwin.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/pefuguxuvugazidixujul.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/keverek.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613033d35e122---jizatunifabizudidugef.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/39930690695.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210905090157_1761985808.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/galotobon.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/83136923709.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/2048814461.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3745a9c19---tujozewefu.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/jabebaridolaboposulolu.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161359837366b2---99835802078.pdfIn PDF document text
    • https://gdaniec.com/upload/files/sozetidugigenuraxinexadug.pdfIn PDF document text
    • https://nexapos.com/upload/files/86249537269.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/bukisinajotaputaxexe.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/38553526862.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/maxud.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-7/20210907080621112197.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/52443052205.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/35875610510.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/57132494901.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/doguruguju.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303e9134d74---17385130150.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/valukajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=in+their+room+berlin+watch+onlinePDF 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_off0000dcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAC 10504 bytes
SHA-256: 17b45abaaf243c79326dc1a61bb7b63b5c40199f55c1008b1470f6413436ed2a
font_01_sfnt_off0000f467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF467 18080 bytes
SHA-256: 50a3c77a784e0c86ea665d0759702de859154c813ec5d02b296a0a7233168598
font_02_sfnt_off00012313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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