Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5efc1dcda546fb2…

MALICIOUS

PDF

84.0 KB Created: 2021-09-18 20:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 409d384b959ecc128c65f022835151a5 SHA-1: 30ca07e0dcca25ff447c778a6c38f049308dc99c SHA-256: b5efc1dcda546fb2cb1a18f0c0e8b18b0e8afd8eefde6207d49c527d929c0cb1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to distribute malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade gateway scanning. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://laborke.ru/uplcv?utm_term=reset+screen+lock+pin+android PDF link annotation
    • http://ave-france.com/pics/files/5189757873.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/burexetegudikokowubugo.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210911141055.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/pinagun.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/55723634631.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/luxizikezasumomonojopixe.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/87728812213.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/jukodusozevegezewisoz.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/towexojum.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/zobopurin.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613fedc281c4b---25561073926.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161343850c13f3---35227457796.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/41944912781.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/zuvamevotigoxopagug.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16138ebd2955fd---xigovanagumuzobumelop.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/laxeton.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210907091831512.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/96072305778.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/janamofilupekefugawikaba.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/8889994031.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa01b8b9aa---vevutuse.pdfIn PDF document text
    • 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_off0000e4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE2 17344 bytes
SHA-256: 88b64e6d5ceac7d9d210f3be3e30820a9b1b799bffc7061149373d4395b340f1
font_02_sfnt_off000129c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C6 10644 bytes
SHA-256: 5bb80d96b38cf6d0b41fca651f8cd80bd7fc1968043b1dd12e4955e1a3721ee7

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