Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b1598aec753a2e…

MALICIOUS

PDF

83.2 KB Created: 2021-09-09 15:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5902f2860235124e1c72106310b1cf35 SHA-1: d7229b305f1e90718263d6ab5a32e01492b175e9 SHA-256: d7b1598aec753a2e0ca1b9db94e098840c7e790db0827f000308e540333bd356
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and link farms pointing to compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of embedded URLs and link farms, particularly those using 'utm_term' parameters, suggests a campaign to lure users to malicious sites under the guise of providing downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://medvor.ru/uplcv?utm_term=download+game+spiderman+android+gratis PDF link annotation
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613940597f244---90437506358.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/6135d8a7a7b4f.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109080649245844.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/luzodituzusoz.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/zejeworibonenob.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/86729555837.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/64007257804.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/lepinokizetivokid.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161380a97b26c7---mitatusalo.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/fadimis.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132aaaa6bf09---mefomelakumuwazu.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109032001242494.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/titewalem.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/puvelete.pdfIn PDF document text
    • https://bdata.vn/upload/files/jusuxisi.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/tefuxuveporozifoku.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/728857010.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/nepevidupojejul.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///rasozij.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/26696678094.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/mixisopasefezewutanopiso.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132fd53a445c---jixetexewafamoxuvovabego.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/jujapafiluxi.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/teweponufigo.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c882c3464e550ce587b440772a3bb85f/bajugewugabevaminopajozox.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/suxatosiwakigefuvera.pdfIn PDF document text
    • https://tmtteks.com/files/zifotasusikezoberela.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_off0000e342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE342 16552 bytes
SHA-256: 636256ed080609e470dd5ecbe927b9e225cb7d03f31c038b944d086fff750918
font_01_sfnt_off00010e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12639 10820 bytes
SHA-256: 31171d0a1d23a939f2fbac45edb53a6e1353be25ba24626a58e4805316fb5968

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