Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde3d7922d8a3e6a…

MALICIOUS

PDF

74.6 KB Created: 2021-09-20 16:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f0ad4656d2f231271098ee55d500aeaa SHA-1: 4fa155e629893cdcb196136d8d1e8ba5380a37ef SHA-256: fde3d7922d8a3e6a7937f45424c966c0711e75d18d78e8161a0aa344af2512f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://halongwave.com/userfiles/file/11334860394.pdf In PDF document text
    • http://hzxgdz.com/images/upload/File/46148914170.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/wedutabadada.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/dazizufepirupogo.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/purogotowixetomegasefuz.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/dapubemonewowulivopet.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16147d71430ef0---96883226926.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/99217025903.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d804f2841a9c9d4b82dfe132dc8b554a/tiloresexekukepugeteberu.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210908063711052946oxd0s.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210908_0E8E1CBB6156968C.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/0db8994091ea8208de72a72397d8f9c9/todojesit.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/zuruxevezewa.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/53585969602.pdfIn PDF document text
    • http://artospace.com/pics/file/jogak.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/8555321471.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ijelel4646ebung49m3rnm7p16/tajizeju.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/24927684762.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/gezunogokajajugonebutaz.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/3ea3dd1cc427d88d6c7ee3de458b187b/wemasesotelan.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-2/20210902134837836575.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/74156528022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+walking+dead+season+11+torrent+magnetPDF 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_off0000bf4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD764 10888 bytes
SHA-256: 9d72af1856c164426a61294e6320cc7092ea294d4521b518c72179ffff092288
font_02_sfnt_off0000f046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 16868 bytes
SHA-256: efc3a8f13830a5805d4797cca06f87356c420ae810979efbea9d45629b6f52de

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