Malicious PDF — malware analysis report

Static analysis result for SHA-256 6545ca0bb8eaaf77…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 03:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9159cdb13d2ba8e5d2e375fa61128351 SHA-1: 8fcb22cb675e82a7704017e13a28a1ba8a2be083 SHA-256: 6545ca0bb8eaaf77a2217dc72021e4ec51e9d6b04ccfcbe0952d2c5e91706da8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing or malware distribution lure, as indicated by multiple heuristics flagging it as containing links to potentially malicious content and compromised hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. The numerous embedded URLs, many pointing to PDF files on various domains, indicate a likely attempt to redirect the user to download further payloads or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://laborke.ru/uplcv?utm_term=compass+manor+lakes PDF link annotation
    • http://screen.by/images/file/65806504176.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/46685343322.pdfIn PDF document text
    • https://12shio4.com/contents/files/jogekoj.pdfIn PDF document text
    • http://halaljones.com/uploads/files/litev.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tusibubejopabixamub.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/lujumefoxexok.pdfIn PDF document text
    • http://cutskytools.com/d/files/fugodokodanowononaja.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140227fea3e0---23503870720.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/81382166943.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/rrmheqedsuo0f7licec2niniil/rebature.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091401251448738.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/fafibafebezufogovatofi.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/89906448842.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/77422576158.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613bebd766b3f---64598669726.pdfIn PDF document text
    • https://italvaping.com/file/rofubipatarovese.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/62969885997.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/wunupiv.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/buzulekisije.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/97207053108.pdfIn PDF document text
    • http://apsons.eu/files/file/wixonavezebedixikozetovum.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/nopavaxeziduwanepufenu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/de0f073dcdf4196f01f8ac52ec2ec592/77374455339.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/bavapuzezowa.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/bivab.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_off0000d98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98C 17860 bytes
SHA-256: 9a9824dc8b9f9dbee51c6731944ff0f707962296070cb0953e708a6fedefd25f
font_01_sfnt_off000106d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEB 10344 bytes
SHA-256: a9beba7ddf2fd4fe0ae0b71cd040b743da940f846a19a9ae096753a36e32767c

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