Malicious PDF — malware analysis report

Static analysis result for SHA-256 97232e612dba05f9…

MALICIOUS

PDF

76.3 KB Created: 2021-09-30 21:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 987491f2b8590a0ba77333353400c8d5 SHA-1: 6782438651fb6a720dd6753f49bba08b15366be2 SHA-256: 97232e612dba05f95699bdef7d2ababd8ffe838c2d6be105b5a31d44d92c6ed3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm hosted on compromised or disposable domains, designed to redirect users to other malicious sites. The presence of numerous embedded URLs, many pointing to suspicious or unknown domains, further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9804

Heuristics 7

  • 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.
  • 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 http://gpszone.hu/upload/userfiles/file/1653803562.pdf In PDF document text
    • http://eortak.com/img/fck_temp/file/fotora.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/l6n99bbmn6jlrb5csmoi7osj0m/55661917658.pdfIn PDF document text
    • http://ipceurope.be/assets/file/24859880970.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/52883718577.pdfIn PDF document text
    • https://123natura.com/stockages/files/52945916537.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/kodifo.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/6633994893.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/25430229403.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/fisob.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/minis.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/fipurixuxasosivum.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/67992728221.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7d39c2283---lozerewosopinekumos.pdfIn PDF document text
    • http://hmed.vn/upload/files/78515526728.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/xamiji.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/ladaxisekufufofujapuzipak.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363c5b838b1---93183226770.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/wekeximobepute.pdfIn PDF document text
    • http://rurisnet.org/images/file/metulawetak.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/fabosexogotesaro.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/fcc9842f37132f2c7f1e9aa8b60b8376/sugusazino.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/54524277132.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/vobev.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/82784975510.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/bf76c7637671854f8b2afdf4a7de08ce/rizemosiwawafumidafixuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=reset+cell+phonePDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBA 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_02_sfnt_off0000e394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE394 10164 bytes
SHA-256: ba15a470ef8d0ba5d85f4ab245e7a94086a31cf5d4c368347ba4212db7b2b038
font_03_sfnt_off0000fa4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4D 16260 bytes
SHA-256: 7b6283439d80ce4a89f161fe7841490762636e9381f2e596625d6bde4132826c

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