Malicious PDF — malware analysis report

Static analysis result for SHA-256 113b77507f78d7c2…

MALICIOUS

PDF

99.4 KB Created: 2021-09-01 11:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e690397b6a0b0d4e61ca5b307a4d8e06 SHA-1: 1acff70a1d1c183b00bc882cad4ea4587dfc5579 SHA-256: 113b77507f78d7c2ca48a0068c5a4b460590d3b59c5f7ebca565094f97d0a9ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads and disposable hosting. These elements suggest the document is designed to act as a lure, directing users to download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=cutnell+and+johnson+physics+9th+edition+pdf+download PDF link annotation
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/d7112689c75260249ee26fc28abccafe/62656053776.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/kejaxunu.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/gadawepomazo.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/9683645376.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/f475188d41726766a53af603e72745a6/vemawi.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/10851444865.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/57512485379.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/dokozudajubaxikimat.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/73916942468.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/40f0651be970fda3e16660ddcaae549c/63194807777.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/fabozojim.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/sigixitemokalosujogug.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/73758676593.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c98e5b11f8---zejave.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/16791132796.pdfIn PDF document text
    • http://klefmarken.se/upload/file/debagexesolowulowije.pdfIn PDF document text
    • https://ive-cal.it/file/sifelemabul.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/788c2bd6a03eff561101e6b17b5bc695/mupabekutuwerufu.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/nevamodapimodelagegudad.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/ff3d1ac6dba0ba9176538b94b222cd45/bapisimerexamupuxi.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/zuriz.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e81cc30af---22645369632.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b686b0be50---bizerotobo.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/todelotifubikes.pdfIn PDF document text
    • http://ipceurope.com/assets/file/77752316796.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_off0001170a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1C 19456 bytes
SHA-256: 904211f694b738c481da4fc6fa6bee87b7a88d88cfbab6c6de929b92ed98674b
font_02_sfnt_off00016293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16293 11244 bytes
SHA-256: 1c95664c7bf1a36bcfb526984bdc0b6981a23fb2aa3be4d37023399f4f2336dc

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