Malicious PDF — malware analysis report

Static analysis result for SHA-256 66737d23a9c519a5…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 10:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 34861ce72a79784544034b22667a7070 SHA-1: 1e1ed65f9307eb4793cf439ae48ee3a3090e7f1a SHA-256: 66737d23a9c519a5d0e6f7d755ed4b9c6580df7a8a999dd295515a6b44da4b4d
196 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or malware distribution lure, as indicated by numerous external links pointing to potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites, potentially for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://infrive.ru/uplcv?utm_term=pogo+spoofer+ios PDF link annotation
    • http://tichdiem.surecare.vn/uploads/userfiles/file/55523290616.pdfIn PDF document text
    • http://halmar.info/userfiles/file/13312089403.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/60903468236.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210911_135500.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/33482929924.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327de4480d6---98078444041.pdfIn PDF document text
    • http://dejede.com/userfiles/file/84627268415.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf64d825a7---30064696334.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/2lbmla2stvsjhvs5nt56hp7dn5/34257098472.pdfIn PDF document text
    • http://rhondachem.com/d/files/51703994331.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/52451099112.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/gifiteburadez.pdfIn PDF document text
    • https://webmenuplus.com/images/file/5155447391.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/8s7resr1fe4051cpctmk08dev6/golipizun.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/93181158876.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/nopirogobukemoro.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/pasalujutekot.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/60662783209.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613964b292446---10852769965.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/witulakipodefajuf.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424aca56343---wilumok.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/20563331969.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/39755482411.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/baweru.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/jofaja.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_off0000d497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD497 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA9 18528 bytes
SHA-256: 735aa661f80b01616747717f5dba963f310ca30ef49334cbb03e950537c078d1
font_02_sfnt_off00011d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D03 10124 bytes
SHA-256: c9d44470bf6a812c6130e633a46b3649059833f214cd4e5f0916fc095559d949

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