Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f5d5573bbe1a32…

MALICIOUS

PDF

82.2 KB Created: 2021-09-01 21:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 643aab5919f5bd71de3fc012133288cb SHA-1: 36909527e626eeed2aea9af69ecbbf91f36ffec5 SHA-256: b4f5d5573bbe1a32d5105e73a647de43edbd89358dcbf59e094dbfe59398de15
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The heuristic 'SE_CALLBACK_LURE' suggests a potential phishing or tech-support scam pretext, aiming to trick users into interacting with malicious links or content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://itps-group.com/uploadfiles/file/27610435147.pdf In PDF document text
    • https://fishboat.hr/files/78914292793.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/25568060799.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/45165402760.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/funaropezevixelome.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/suzizoforabu.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/jitamalejome.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/terirupopaj.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/91014607489.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/57162961044.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/zoxafemurifiti.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/75625080042.pdfIn PDF document text
    • http://novichiha.ru/pic/file/15750155897.pdfIn PDF document text
    • http://samwha.com/upload/userfiles/file/78164742093.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cc786bd06---26234580459.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/40382374156.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/dobabukuletobijuzo.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/48507976828.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/saxuwuxevifafiliregobakum.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160f0b093e03a4---68813760844.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/r0v07o2fnqtjoorjqli5raqk7j/kenivuzuker.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/45729539742.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c86ab6c1310---40820039031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=area+of+lateral+surface+of+cylinderPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f69a745365---danasozajekowozobepoxopop.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_off0000d61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61E 10664 bytes
SHA-256: a642dc72b4e7173f5404281952c1336febfd85df6e996bff1af7eb02e936308b
font_01_sfnt_off0000eeb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CA 18876 bytes
SHA-256: 559c3e8ba9b4a6d63004ebc96e4c36a030c629bf3c0667094dd8e9557649f857

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