Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c6480932ba7952…

MALICIOUS

PDF

86.6 KB Created: 2021-10-09 01:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 01ef8cb8ee6361103a908c4b31a49bf2 SHA-1: e885130eaceb1b977fdd850cea2d83c930185310 SHA-256: f3c6480932ba7952f51dd8106ecbe762760a50fb94ed92196872d8332cfc7685
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. The document contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of these links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://verredistri.fr/xmedia/file/88298593640.pdf In PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/dc63a72140de41e10fb4d5e63c0c7b20/warukefevorenekunuk.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d0360cf9b8---nuviwumexoxanabulegixizo.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/40055757806.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/4osueo7b6vr1ukrgfdrbg7lrgb/zixojuredixipaf.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/46233051805.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cc45e484ce---vufavazigerabibigi.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/kixuzitamiparagej.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210902192244.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210916_195539.pdfIn PDF document text
    • http://sartor.ru/upload/files/matefutovarodax.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/8686350072.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/xiwalanopefadiruwefoti.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/59230866432.pdfIn PDF document text
    • http://szcftz.com/upload/9080999416.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/xasegevel.pdfIn PDF document text
    • http://vibratingsieve.com/d/files/89771786510.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20211004205942.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210903_C7C224D1E5A751DB.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/fd42ce28b7cda2abb7caa4427ab28725/18324707923.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/32585506459.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/dewipedulilinamaloxa.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16159ad15659f2---31616538827.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/madusofun.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/63194297922.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/57401951.pdfIn PDF document text
    • https://hinaweb.com/upload/file/gijizudutibiruwabemaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=label+the+parts+of+circulatory+systemPDF 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_off0000eb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10393 10952 bytes
SHA-256: 660862425e2d905958f89af29cdc2115383932bfa7166e38afad61cb34653a3f
font_02_sfnt_off00011cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCE 18472 bytes
SHA-256: 04f497418252fbbe1125e6acc56cb14c9a118dad0301d14a8be047662e8a7ffb

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