Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c1464f38b333fc…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 15:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 11cbc30c7c0b86980ae610281c3f4510 SHA-1: 165a7fc8521426136d55999cc6fa4ec2964d4217 SHA-256: 59c1464f38b333fce822cf6188b9e6f88e66095ecbd0f0ef7ff4bebd31510d4f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious actions within documents. The heuristic firings indicate the presence of JavaScript actions and links to external, potentially compromised websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=b612+app+apk PDF link annotation
    • http://cementfeet.com/userfiles/file/xivedanabimobazeme.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/fibikamowotivowodup.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133404084a7b---jojiputiwamufopevosapole.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613418c7b46e2---kojasuzapo.pdfIn PDF document text
    • http://skupka23.ru/upload/m/20652713270.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/15011763593.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/vujekiwatulukemirizawusaj.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/xugolodilivufogeloto.pdfIn PDF document text
    • http://grandviewcommunity.com/userimages/wipaveporimirabopiwopu.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/82527023285.pdfIn PDF document text
    • https://digireg.se/upload/67239006628.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/27109202290.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161389c86077f1---jopafif.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/94542621025.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lj1l4tach55ncp5ae8ogg7q3e2/73033674480.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/41900048746.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137fe50676c4---midibizaxifetufijuvogoz.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/10094758760.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/30903097103.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/falajuligamasenegabe.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/3986734243.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_off0000de3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64D 18456 bytes
SHA-256: 94761d1fa17609c09cdd2432847642f4554fc0b8ac7fa6ca3dd52c7782642637
font_02_sfnt_off000125df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DF 9868 bytes
SHA-256: ae4d34521122e1cf6ea8116567761bfc0b186977cae00134f544aa2be6c476d6

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