Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cfac46c3b29d2b1…

MALICIOUS

PDF

84.2 KB Created: 2021-06-25 12:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 360b97f0cb8ee064f4fc89b899fbf640 SHA-1: da8a6a626e92b6321b67f99e91a965049c869927 SHA-256: 5cfac46c3b29d2b19fec5f7c2b9fcfcadd3563e523a9f76b772e875a9b50249d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. The presence of these links indicates an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ffbe5a530---63689112788.pdf
    • http://project-lovcen.me/userfiles/file/21836828345.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094440c76166---61427642804.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/fi12j6eu8a758ptm1m0ps2advd/nugukabefukuwagug.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b2af1319f---71076277440.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/f82f99a52012ac23709e588dd951d96e/79121332766.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ad661b795---paxolifiruzipajawuwisor.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160abf65338016---fawofevapatovewarokesuwa.pdf
    • http://meadescafe.com/userfiles/file/kulitupikulefutitilabezix.pdf
    • https://ystechpro.com/nbloom/fckuploads/file/24951963400.pdf
    • http://hzdsbg.com/uploadfile/1623563875.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986c6838dd4---84574681379.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808b353127f---wijurujesesijelalogofujex.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00576bb621---dipozopawewudi.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4776b5dfac---73381414428.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04f44ecb69---bilejixawo.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dea90ea91---13933499128.pdf
    • http://outspokenholland.com/userfiles/fckFile/20210518215349.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=what%27s+the+difference+between+a+manual+and+automatic+car
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AD 16792 bytes
font_01_sfnt_off0000febf.bin
3aa0fdb70243c6fc89ba769719e1e3b7a76745108cdbf350dbd5e369e51646d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBF 16552 bytes
font_02_sfnt_off000129b4.bin
4f96a2d0466859b4145dacd82f4801dca6a3bd22be5cc6c0bc114dd4c0960e31
pdf-font-stream PDF embedded font (sfnt) at offset 0x129B4 11092 bytes