Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa05ba9853f77e78…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 13:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3b23fba36977c05f4789304f8bf6559b SHA-1: 41273409fd4eff2433cd2eebb52f79a38fa7b3f8 SHA-256: aa05ba9853f77e784ed569af1c3e8868299257645ae2f11d13c42f7830794bea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, including one identified as a compromised CMS upload storage, suggesting an attempt to obscure the final destination and potentially host malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://nedirajtebosnu.net/userfiles/file/lekexumixapu.pdf In PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed3a3916b0---xirajitukikilexudov.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/16058649883.pdfIn PDF document text
    • http://abpaluso.com/upload/file/tosoliwatekokajekepomid.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/dulabosilaxurefuv.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/lamufidixikerekavu.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/zapodixe.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/palebo.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/91989336557.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/19031970057.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac509591f2---vafukulutezopijoxavazope.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381edaebe46---kuvol.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/farebuvovidegovarukawukel.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/90558821422.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/kejew.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/28512926501.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210909025410.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/51131676612.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/62596440421.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/doniro.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8285a2724---xokasimidu.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/fural.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/verivis.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210901140613673557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+make+anime+videos+on+androidPDF 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_off0000dab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB6 10600 bytes
SHA-256: a6e5e66e13f2360c51688b6032924070496ef06a2cd7c6225fff96deb87ba36a
font_01_sfnt_off0000f2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B00 17052 bytes
SHA-256: e99694f76661b1a9cf8384cab24259965a29726114a3f9eb0f0805c315a3867d

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