Malicious PDF — malware analysis report

Static analysis result for SHA-256 880868e9d79c3cf6…

MALICIOUS

PDF

166.3 KB Created: 2021-10-04 20:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d284d1021a2114d9ffb5cb8943d589fb SHA-1: a316b66b1bde5c5e17c771b9e6c049112230e57e SHA-256: 880868e9d79c3cf6e2511cd5644eeee8c384f42d3947dac17f6740c26e4f596f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://www.habitat-morvan.fr/ckfinder/userfiles/files/xodobobif.pdf In PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16131a36eba2e1---23821128730.pdfIn PDF document text
    • http://ntpuvoice.com/ckfinder/userfiles/files/77183046355.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/vga41nh6j01jqjqdchc3u1avru/wudokopefewivaxerubuled.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109040625136699.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/karaxudomoludijuzo.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161509a78aca89---vanuxinimomem.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/24204889967.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/xujevixilejakenalo.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/zopodijazexumof.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/25976732468.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/jivelogajopidatufatele.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/29312951027.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210906174829.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4d08627d7---99858567456.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/zemujubebumos.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161561b9be3ad7---nikekumozamuwudap.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/12017298020.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/27798984252.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/72283844239.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1627c32d6---78666957431.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161538c4ddf944---45322195907.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/lanakuvebapawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=math+in+the+midwest+2020+answer+key+escape+roomPDF 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_off00021c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21C0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00023421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23421 11260 bytes
SHA-256: 929b2b26948115226e9b46a18bbea063810d04d6b44ce1a7b44ba6e32e39501f
font_02_sfnt_off00024e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24E7F 23576 bytes
SHA-256: a5095ee4f359cfc250a6ee235d2a775838a75a9efd56cf9b981ba08b13d5989b

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