Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde5f9699e15e818…

MALICIOUS

PDF

85.0 KB Created: 2021-08-10 00:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e8feb1e95f80570b89b3efe7c4697e0f SHA-1: c8309cbf349b283544d25008fa5d87363a23de8d SHA-256: bde5f9699e15e818d305c1b7188fcfc21f24819324e84480d1bede1b94be0b2b
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains, suggesting a link farm or redirection mechanism. The presence of these links indicates an attempt to direct the user to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://wastran.ru/uplcv?utm_term=delonghi+magnifica+s+cappuccino+machine PDF link annotation
    • http://doggystylzgrooming.com/admin/photos/file/marubogokixavok.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/likud.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/d18bd2e8f262e414f6e1bd9ee920be82/39251204441.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/tanipobegevenalubu.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c535282aea9---pewikugoximane.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/cdeae822e72be4a74df8d096a9159455/70252190622.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/62279692799.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/5366a05297f942889db28d3db499431a/52474743587.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/14370914957.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/48522440439.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/ninepudepumilezibez.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c96dba63b---fezagotoruvavetagefuvine.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///49438780430.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddc4c1ff5d---zonakopu.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607368dcc961a---fazasosan.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/fibotawarubi.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cc4fd61697c---89523907174.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/mupirerivimosapuwazo.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/61527541867.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdafb669ef---66767477738.pdfIn PDF document text
    • http://palami.by/images/file/12318896430.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210522103107.pdfIn PDF document text
    • https://thietbiotoviet.com/Images_upload/files/62143561407.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a18735352b4---82914997091.pdfIn PDF document text
    • https://adikkedua.com/contents//files/razuginajojelifefugupogag.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_off0000e74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74C 17112 bytes
SHA-256: 174f16c831a8f52c102148144944836f47c4e327141e6446d56c830b74978531
font_01_sfnt_off00011416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2D 10828 bytes
SHA-256: 8cb5689290701cd820485f83b8e90c9d644234cffcf4c03b98bedbaac99b4edb

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