Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7228683daf01666…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 08:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: de707fd4a62cfe418c0232aff01f8e94 SHA-1: d1bfe4335ff41b6ad2a703ce142b7660b6c5ef86 SHA-256: d7228683daf01666bfeae0848ddf700a031c797e5ead93be92a118b95b342d50
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable domains and compromised WordPress upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://metalzilembo.it/userfiles/files/dijopowiderimukowibumo.pdf In PDF document text
    • http://librojuridico.com/aym_images/files/xutebuselamikofifol.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/15956401552.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/ramaravewo.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/72078438087.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f2fd76969---fusogifijomufoj.pdfIn PDF document text
    • http://unleadedcoffee.cz/soubory/18468075502.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaba6dbb6c---gomujulosujog.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/79017870788.pdfIn PDF document text
    • http://paliukenas.lt/i/File/kugevalag.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/nikubafadonafebaxer.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613619d212e2a---goxalizuraxitil.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd4a6b2770---defawevu.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/leniw.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/16935969565.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/likakogemodi.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/funilidutimesepuwumoloxoj.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631161354.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/rk1n0da2nmn6rq5q79lar6ej24/tupekeduxumivo.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/puzezibobanolezorok.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/pakimo.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcd0819219---76996016159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=assassins+creed+3+apkPDF link annotation
    • 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_off0000dd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD89 10488 bytes
SHA-256: 50b464920753e5ef410005b9a79d5d06dd2c3853dd68e02baffce426c2925491
font_01_sfnt_off0000f589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9B 18704 bytes
SHA-256: 698a384c5bb4055e035c76b6dc28b107d96838a481e3891c27f0f4c6d67bf1b2