Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c177da38ee65b2…

MALICIOUS

PDF

76.2 KB Created: 2021-09-15 10:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d73e7d35b89ffbd62ce88555634ced78 SHA-1: 9dba811d7fa416391dd9b9bca38a7fa352f12664 SHA-256: 76c177da38ee65b2afde20301efb4e7938233fb497d0adb766b79714e5da4031
196 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a fake browser extension or update to achieve its objective. The embedded URLs and link farms suggest attempts to redirect users to malicious sites for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=where+do+i+find+my+browser+on+my+phone PDF link annotation
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/1a73b2bd3158cbca1dfaddc95878ba08/83892068972.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/23422287492.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/66561765594.pdfIn PDF document text
    • https://sitarasign.ir/data/file/lisowepegixogesu.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210903_141316.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/51668642778.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/komaxefawamelivupu.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/89171316722.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/pimipuxukawe.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612eec71f3fcd---banodipod.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/tinugozekotosewetubaxirez.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/kifogofejigo.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/zebogalomuzizofoxuwowu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a116ff21a4---4239095389.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109051925537291.pdfIn PDF document text
    • https://masukpt2.com/contents/files/14027505285.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/pijododizemebadewuzekon.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/78504354516.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210907052607_133802191.pdfIn PDF document text
    • http://fabtur.ru/upload/files/73193081463.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/03216ced141f66bbb8d32cd7d02f6e9a/13170450273.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/11260271731.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/50levgcl4ac79fi4rb72j5os20/3917346675.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/80227595125.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/pumifobokitiluvixobera.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_off0000c6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D2 10788 bytes
SHA-256: 06c9214c8a28058eba6c5eda427eb2fc01522dd9f131666caeddb8d145e6016d
font_01_sfnt_off0000df4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75C 16608 bytes
SHA-256: dd415cd3e4784d2bde0e22cfc680c6e0d20b6c55e984612490c927511f25ae0a

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