Malicious PDF — malware analysis report

Static analysis result for SHA-256 4877adfa249362b6…

MALICIOUS

PDF

78.8 KB Created: 2021-09-02 09:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f0658439650743102e8e53dc3a7d2452 SHA-1: bb31637f83535550cae6824d7584b26ab8d89ccc SHA-256: 4877adfa249362b6caec4a5b1221cb9a7bc2810f9a38b8068813b3fd9aad61cb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://synerhu.ru/uplcv?utm_term=animal+crossing+isabelle+hot PDF link annotation
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160800e9a17d5e---50442637794.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/lajadepuligizakumizole.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad89578c392---dekegimorix.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2882fb6335---9744062889.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/9f11c877bb49d46c4c7bf0505472fadd/gafowozenet.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/zizagax.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/1b7292b4f267dd3d3882a48a6c9bc932/pebituxe.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/55523574870.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608491a776cc2---furojazezesegejilalabuw.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/59907923844.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/borusimodoruwagaz.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc509973a7b---gawepadunemajukokuxu.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/156dc3624cb88c4ebdf6b4401930b879/wazijatalavor.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ff92b68119---jafegitab.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/90psted3oqe0jfdsekko2cn4ui/36307871003.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/61629291136.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b43569e62---63084878216.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/befinefuvilizovojuvepiz.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/xegukoziz.pdfIn PDF document text
    • https://hgb.se/filer/file/28180216992.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9684c8654---18085578304.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/99207784330.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/62099643257.pdfIn PDF document text
    • http://bakoca.hu/files/file/34812871924.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_off0000d152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD152 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE964 16708 bytes
SHA-256: 794f6df88e315d392f2244fc30f89884a2c002307132a79f52c4f4fc77c60f56
font_02_sfnt_off000114a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A3 10796 bytes
SHA-256: 5134a34ae6818516eaf80898686afd720ec4a7bf8077f10cedf051dd34d9c793

Open this report in the interactive analyzer, or submit your own file for analysis.