Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b16b2cceccd6d0…

MALICIOUS

PDF

83.7 KB Created: 2021-09-10 19:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d72bf75dd836e399a91b50a89d82279 SHA-1: 5cd277a7b5600a6245ccadbc8e4c303c1a9ff0e2 SHA-256: c0b16b2cceccd6d04bfcc35a8ccb9038d177396786af4ed84178419edebb5ea2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further payloads or conduct phishing. The presence of embedded JavaScript indicates potential for client-side exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kaizousha.com/js/upload/files/884070175.pdf In PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/dofidos.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613432c4a4864---53979287315.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ba2644f57---89173713115.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/72554755815.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/xolazazejiniwasovof.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/45848770255.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/dededofufoxuronodumozuwiw.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ptvjrgq18gso9ohbu16ijuv5c0/27651992419.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/82676251129.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/77205406352.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/42766463308.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/97453700242.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/sisosisaxilirodomogute.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/62213723137.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/tikonivifewuvisiliwuma.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/18221016101.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/pugoresowepawurapof.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/89735699889.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/tekegasoforolono.pdfIn PDF document text
    • http://savemaxint.com/files/file/56119463674.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/65858841442.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/38672667535.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/6184281b16c2b98db5c86a3761543bee/piwinanuvafamevexover.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=mac+to+android+file+transfer+wirelessPDF 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_off0000e460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC77 10548 bytes
SHA-256: d9587f8709ccd899653d53a9effae5213bee38dbb26cadd2a224b9b9ceea7954
font_02_sfnt_off000114b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B2 17532 bytes
SHA-256: f9574e5ae7b1c83544a04484073af9582b4a355ba2e9fd70f14efd2835b939be

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