Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db3b8722854ff83…

MALICIOUS

PDF

77.2 KB Created: 2021-09-17 09:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6deb62ede12d685d2eea661ac09c10b2 SHA-1: c40f33ce832b6b8d55d895368df2732961af66fc SHA-256: 7db3b8722854ff83870a407d0868e01b0f2155292feaa3352944d2d19022afb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, directing users to various external URLs, some of which are hosted on compromised WordPress sites. The primary purpose appears to be to lure users to malicious websites through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=what+is+the+best+keyboard+app+for+android PDF link annotation
    • http://gocchame.vn/app/webroot/img/uploads/files/60440363875.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/56623395010.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210905153015.pdfIn PDF document text
    • https://5uempat.com/contents/files/81230438902.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/koraxodego.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/29947081249.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/60c8e1739d594f7c72e7a80e69d1d054/40098999385.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210908_032540.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/gefhdrb2u937oljlgllgkv5iau/25251765810.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/57182392887.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/kuzek.pdfIn PDF document text
    • http://taociren.com/upload/file/210907055044665751usg7vn0pypi5.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/bezivifadetutumezoj.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/lenujesazuvola.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/30b25ea149d8e7add14c9f1059cb7334/kupafawiwoz.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/jakoguzoginowixidanuvopa.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/levimukojepowalalibajedu.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/30200197071.pdfIn PDF document text
    • https://trainova.com/userfiles/file/viboxonizemox.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/bujenupigujabavanabul.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/lolotav.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/6fbee0fc897a5bd6836e74db2400a854/tokojixasibafatepexexomin.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/soketu.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_off0000c7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF6 10888 bytes
SHA-256: ee213d846c6f28308b681b845c16a83ac681e9359e52707d9d37d830a5e4c50b
font_02_sfnt_off0000f8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EF 17540 bytes
SHA-256: 174f5421f5a35aeb6901a3f7427cb2e9ec8690ff15b618b871e64f5ab786838c

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