Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f379e2a936b1cc8…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 18:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4db302a6d55200bfa17fd732c08aaff9 SHA-1: dcc1559b8434b43dd5496c451e6ca75b363eb777 SHA-256: 4f379e2a936b1cc84ae3f97d4e06579fd98a25127af9875b6841a7b308d03244
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest a phishing or trojan payload delivery. Although no scripts were explicitly extracted, the nature of the links and the PDF structure point towards an attempt to lure users to external resources, likely for credential harvesting or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://nomylo.ru/uplcv?utm_term=plantronics+wireless+headset+manual+cs540 PDF link annotation
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089bacccd329---fovuvewaxegijubawiv.pdfIn PDF document text
    • http://travelstore.tn/userfiles/file/wuwovirogafumosumelax.pdfIn PDF document text
    • https://okazionche.com/files/34163329938.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/miwamonebagabu.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/35417115006.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608228e71a940---92139744256.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/rexakifaramufabu.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/newatevowit.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b5a8055d94fcb398caf9087e7d5062a4/lirumiruxidugi.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f012f9a13a---xurisazovemawedevumi.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/guxipebadesaberuso.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/viwopudejuwefig.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/49962654305.pdfIn PDF document text
    • https://mgc.to/sites//web/upload/files/pekobejozababedozexufisar.pdfIn PDF document text
    • http://silver1979.com/upload/file/basit.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nesenulowutusizokafonewe.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160798929e6ac7---fikaporowudasotixaxupo.pdfIn PDF document text
    • https://chp-travel.ir/data/file/podavilibosawumo.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/ziwafudavosozijipunib.pdfIn PDF document text
    • https://smartdeal.pl/files/upload/files/27958145674.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa1c0553aa---17299107570.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/1b16944e72bf180ff3f6d831e0664291/28597779587.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-7/20210507091544177107.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97f912450---87351053103.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/tigabatufepotiw.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/27940228418.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_off0000dea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA6 11156 bytes
SHA-256: 3b082df6b1be57b694c3ec745aaaccd1ef159602b66daf05e6cd87a69aa1579d
font_01_sfnt_off0000f8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AB 18560 bytes
SHA-256: 6c90ba751c635da1ff63e7bb949b75ea57040d0e33e389c3f4c63facabbfe194
font_02_sfnt_off000129b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1