Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c05bbdf683d9d4…

MALICIOUS

PDF

80.7 KB Created: 2021-09-12 16:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d9dfe83a23e52f73a57be77188a490a0 SHA-1: a7995bee47130bc6ad930e2b53f433b66df42acc SHA-256: f1c05bbdf683d9d49c73f1ba7bbc48f4abfb29c41ee6a414355baaa62c067a39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links, combined with the PDF's structure, indicates an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

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://drafthe.ru/uplcv?utm_term=android+ifttt+alternative PDF link annotation
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16135502479ed3---54372730445.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/rugodinoxosurimag.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/zavaxo.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1902a400d---82187023092.pdfIn PDF document text
    • http://praguetransfer.com/files/file/49004896143.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/gewamanolumanixoba.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/73095330264.pdfIn PDF document text
    • https://emprenderem.cl/files/70356882873.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613059c1c20b5---nanituvigewusone.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/taxiw.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc085c55f6---momujinowuzod.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/mepewoxemubarewumev.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/tanotapejujisejefa.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327494431a8---zetelidiwerapiwogozek.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/pibavakipimisefurat.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/59374885568.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/juvadawuzimusot.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/50541609157.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/74933347740.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/wadivemesudur.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/siradidazonawiv.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137482ea4cdd---33409742123.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/26415467173.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/20201380914.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-10/20210910082529193908.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_off0000d8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10F 17532 bytes
SHA-256: baf08cc69b9ccea3ca9f19f93ccb3f6985a39439d6fb13b8a17f7f1f4684a180
font_02_sfnt_off00011e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E45 10228 bytes
SHA-256: 8b8dfeed6774ee436f62450385897fec4ba58c5bb14ac93316af3e30077ab32a

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