Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c05b657aef72d3…

MALICIOUS

PDF

76.3 KB Created: 2021-09-17 22:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8923f16a68ddad2242ba1589d7f61506 SHA-1: 3ea731943f05191cd35b51f3dd8f86d1e98957c1 SHA-256: 70c05b657aef72d3245fcc17fa06f3c1bf02b5c70564c766e1f7e03966ad2144
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress upload storage and disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. The presence of external URIs and the 'link farm' heuristics indicate the primary goal is to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://coretry.ru/uplcv?utm_term=how+to+see+the+wifi+password+on+android PDF link annotation
    • https://ssmavidiyar.com/public/content-images/files/47844412673.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/8d819c54425caead22edffea48686a2b/welutazewoki.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/tukoxotare.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/61605139415.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143cd5aea241---nunuroxafigojezuko.pdfIn PDF document text
    • http://imoroz.by/upload/file/zusudikovulafavevej.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f60c30318b---81353381679.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcb34e48f3---niguji.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/49929761933.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/98984992282.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/nudazomepolenimidakoguje.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/wurufazusu.pdfIn PDF document text
    • http://slovoveri.org/userfiles/80047895685.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/39366757961.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/51946236309.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/4577134910.pdfIn PDF document text
    • https://digireg.org/upload/13982379599.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/vemadejuborobexadojeze.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/29982264291.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/bufexulepepalijiw.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/luvetetexafigagonadiw.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/sogefudivimubumijisazu.pdfIn PDF document text
    • http://hhsmelt.com/upload/files/vubazibudori.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/72258961540.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/vizavusimexukazop.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_off0000c4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C0 17816 bytes
SHA-256: d3ba27ef7022c77a80fbaeeda8825839d05f0729e749442fe74fb42d595cbb30
font_01_sfnt_off0000f31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31C 10628 bytes
SHA-256: b50ce5747641e98458d8531fb2d966529720ba54c0f310f8d7452ce70aab139c
font_02_sfnt_off00010b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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