Malicious PDF — malware analysis report

Static analysis result for SHA-256 da180dab4e0edfae…

MALICIOUS

PDF

75.9 KB Created: 2021-09-18 19:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b2892296a604f4abf4c27a172c19f7bc SHA-1: 8e51e15678ac399a2de52cae2a7a17553f9c57fb SHA-256: da180dab4e0edfaeeece46637a6b383f9656e114792402ca30e2f5019538fe87
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to redirect users to malicious sites for phishing or malware downloads. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

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
  • 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://philabc.ru/uplcv?utm_term=friv+2017+the+game PDF link annotation
    • http://canadianrockies.ca/files/file/luwivekazeleda.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/82553895806.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/69844254525.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/dusagiridinox.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/50739111392.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/dupuxemazudigibadaz.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/35541804129.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/30456641300.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/posafejavo.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/86642038163.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/xurosipomijebivogarex.pdfIn PDF document text
    • https://resicolor.com/upload/files/58390471574.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a774152265---vifelabapufuwega.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/mikiveratulevunuwono.pdfIn PDF document text
    • http://leguido.net/files/56987569691.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/sezagizukamokotori.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/1673037887.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/5c248a6782acb4a8c0a974d008a11159/69375911959.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161455c622a172---40018664278.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/81917261392.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/17385327318.pdfIn PDF document text
    • http://jucal.es/images/file/39391368902.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/44183054289.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/67104905160.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_off0000c200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC200 10504 bytes
SHA-256: 9bc4297bb11867d4122044df9de0c44750560859dd4ce11f0fdc63338f2c0752
font_01_sfnt_off0000da10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA10 18480 bytes
SHA-256: 713d9e93b34131428219d9d2d9bf2ca8b02f057b22b98d48ed085a04504425a2
font_02_sfnt_off000109ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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