Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b6d161d4ebba1e…

MALICIOUS

PDF

84.1 KB Created: 2021-09-11 20:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8df3f2a5f3cec7254b702733f3cbdcb4 SHA-1: b2df2306dbaed26a89684b77626cf4a14cce0e19 SHA-256: 71b6d161d4ebba1e22a675d8081aab7b8eab7ece4bca193ac1f42f883ec20bcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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.
  • 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://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4d89cce20---20255436892.pdf In PDF document text
    • https://digitaldaya.com/imagenes/file/6159933159.pdfIn PDF document text
    • https://nomortiga.com/contents/files/tofikisiwinuzux.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/32556986312.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/fomisojazavoxafezedifevo.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/xeborovekopotovisabage.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/b6bucaqfi71p7d0k2rghja0sa2/21114660185.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/52088205728.pdfIn PDF document text
    • http://8njl.com/userfiles/files/fodojevuwakun.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/854fb90bc8e995cead13ff040776032a/66522081292.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/30064101675.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/dasunisererelevuvenikek.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316fec04b04---55194796916.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/nonoboxibevuxowosuro.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/norirosorutumivudewa.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/bumaxugotituxe.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/suduribilaj.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/xumevirikotemipulojulo.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136efea7ef4c---towaramuwewo.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e736500c4---kabekewedakitanuzo.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/16358127863.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/ririwiwije.pdfIn PDF document text
    • http://simonide.org/userfiles/file/20614732749.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/e798c0f4f70980bd41bb942cc83a13bf/devafemipuxuvasuzokomew.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/41075777214.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/6365839034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=top+online+shooting+games+for+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_off0000e4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B2 17428 bytes
SHA-256: eba4196bf5a40274683240a1e37aa84074b60550eb5da74b8754617b678e9a87
font_01_sfnt_off00011198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11198 10908 bytes
SHA-256: 282202cf6d74f3eb5bbcca0b33f7633aedb8aa49e13c2d437dada1b6aaac1102
font_02_sfnt_off00012a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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