Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7bf2811c15aaad…

MALICIOUS

PDF

89.0 KB Created: 2021-06-30 08:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9f88a66c1113c07905912c90bbd2045a SHA-1: 8c4980aaadafd7b35bfb93244f278c4b5d366c8b SHA-256: 8e7bf2811c15aaadf235b15ee33b72e2927a8d7bae470619e4102b536c8e80a5
156 Risk Score

Malware Insights

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

The sample was detected as a phishing trojan by ClamAV and flagged by an ML classifier. Heuristics indicate the PDF contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL findings strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://allycatering.com/userfiles/lamino.pdf In PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/c9lc6ul3brs9u7oe6cu608r7om/tubajiredodog.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092dc842ecbc---71464408110.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b058e971da4---80070973084.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/h8moqj3opnuao3kuegmoimq3v3/90728644558.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210625043344_p7t1j7.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/65040770101.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/eb1a28634a23090a3ecd21b64f7b9baa/gonegakefavetizusomawogap.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/0b27636eaf1a6cb6ed1c4e589b6cb9ab/vitebevavujonunevos.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/gapofusepazifotises.pdfIn PDF document text
    • http://debden.org/userfiles/file/satopodawepefigetepuz.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/lumubagitudilopuriguloti.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/64651273171.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/7b806698e95cb8392c4423a1d8ab47e7/rezawivanizirug.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/94fc2d6f6ba6a753046208fa35d49e5b/ragubawesisurejowemep.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/56208877302.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/cuhc8eg5hhqa9hr6trdhhum055/3843131395.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083402879156---tinox.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/9umusi0fnu1u46gv4cfvfu66p2/fokegebibofojapubagenezu.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/3830643186.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dba4988881---tawasiwupelupodobiwig.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/2b80e18e46faca68cc4d2a3f1f4bbd2f/siwin.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609ead7e6ebd0---tekap.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/6fe71a07f2c3b0d36de8103a235e1f09/63434898606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=why+is+painting+considered+artPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E7 10852 bytes
SHA-256: 9eb9f81fe6e86d32e8056b0f6e6a2101cdcce71f7feca612a24873213f23f0f6
font_01_sfnt_off000111c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C1 16824 bytes
SHA-256: 67e3fe65d259ebdc5c9092cfacb443a7808829e236172da9985e5785cb3dee49
font_02_sfnt_off00013d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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