Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d96d29ee168a91…

MALICIOUS

PDF

93.6 KB Created: 2021-09-13 05:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 178319d39ebb6295df13db16a04a9741 SHA-1: 109d9a17b44a849c3cdd7c67e388673acf8e3b25 SHA-256: f1d96d29ee168a915f8ee01f27fc04ea4dcee40c4c2d7ae1670f70990f9c94c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards a phishing attack, likely using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://philabc.ru/uplcv?utm_term=minecraft+homes+ideas PDF link annotation
    • http://www.frank-diagn.hu/userfiles/files/pavivirazawakuti.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139c98e38d99---41604228009.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/bezutewawukid.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613017b965707---56043405999.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/pukisupixutaber.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/92346162357.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/navejotafo.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210908/file/16310532209704.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/55571322543.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/mugupibawalefelutawolozuz.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/vifuzutiwajozarotaw.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/80227104042.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/6900302495.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/6713595411.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/dawosinukibaruvezakifat.pdfIn PDF document text
    • http://sudeoksa.org/userfiles/file/20210903072117.pdfIn PDF document text
    • https://protum.se/file/31592979061.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210910082152_y6c2me.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/2qi6n2mqljovd889ddnange836/pigise.pdfIn PDF document text
    • http://guitarenko.fr/img/files/vipozatuxawipofovoju.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f52e991c24---gemebilawepujologik.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/fonabamaf.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090407522749.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aacf0d0078---53414498535.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_off000109de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F5 10688 bytes
SHA-256: a427ac43ca3d5c61782443f6aafbfb35ada210ad892fd08b2c4b227361b8b7d1
font_02_sfnt_off00013a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A48 18004 bytes
SHA-256: 6d92818f94580b577c7c625bbfff0d9e45d8a4ef72183e0317590fb3395b6bc2

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