Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5142a3ae1d558a…

MALICIOUS

PDF

125.1 KB Created: 2021-10-19 21:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7f9f1c8b2ff153f7a52f3c959519b2f7 SHA-1: d1337ede539a6cd52b2413bc7ee03e7c7e684608 SHA-256: ef5142a3ae1d558af5c054514283b1129bf620d7a3ffd46df4e197f2e9af3ed8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://farsiherbal.com/cache/fck_files/file/23251157277.pdf In PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/jebowamuwusojadakapupidi.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/nibowabosonexirujijizekew.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/79877508928.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/2dc47eb20f40cdb9c2f3088f0d6a4a3c/5604761403.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/c87460ae0dd149759f0253dd606257a1/tapinewewodafim.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/tanurisevasogezubufedixo.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/91508028367.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/worubuj.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/84516488802.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/44483162168.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/guzemudutelug.pdfIn PDF document text
    • http://ukrfirework.com/images/file/xalosuwipifogesupo.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/30052391514.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/wojivonulinuvafufisitufi.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/27392023603.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/79132552208.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16168ac13145a3---luvokilokuf.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/85779486160.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/15067097085.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/noxomidegokilobim.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/10977859680.pdfIn PDF document text
    • http://tochuchoinghi.org/files/kinasupux.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/marudufebutonawilepukanox.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/nopitumetevapupozonako.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/34409893736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/UsNeCLCzgYg/uplcv?utm_term=saxon+math+algebra+1+2+worksheets+pdfPDF 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_off00018274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18274 11520 bytes
SHA-256: 090fb81cd7c2e31f4a0ffa239e036fe1039c55995f53dc06c5bbbc98381cea3a
font_01_sfnt_off00019d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B564 18916 bytes
SHA-256: 0e4a1ef51832e0294219667ed384c28e0b5a4a0fadfbc6ca2ca7f69c76d1c8a1

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