Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0618e1d76a7a481…

MALICIOUS

PDF

85.1 KB Created: 2021-08-18 07:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b44adeab3b4188e12e35963478759c6b SHA-1: 47e98041dbaafd35ed5c9124681fbcc8d03304ce SHA-256: a0618e1d76a7a48188237d1b7d9d9ce2043c1f5af6bbc4b29f429e6fb0f4db7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the links and the ML detection point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://bibrka-school.org.ua/ckfinder/userfiles/files/64258229953.pdf In PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901bf4632a7---xumunarevexi.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a1ff4b5299d9a200c6a151c68bde3593/32273921869.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/jimunebojubofugeb.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/m8e8fn38388qvtpka3t9jcu8s2/paful.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd73e41e16---73620825323.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6v9fq0tj1g9gv4ao4l90t2cgn5/32054846270.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/ramiwivijukasonuxi.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/24233310180.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e32bdbef87---vaduwifuxumedikusamalif.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///95673300476.pdfIn PDF document text
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/90822502044.pdfIn PDF document text
    • https://kopari.hu/files/file/wamemepalatawapezibim.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/78707380075.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/13828415821.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/22869715226.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/be0e69c96195a30a100209e588d16b97/38210123214.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/77651489810.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/caf9a930f9e876db8508d1962df8a94f/31089420384.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606feaccc39ab---38289170149.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/r4nrklce9amjhkjjaaemd4ubk4/kigutopalojidutejonu.pdfIn PDF document text
    • http://infunplastic.com/d/files/marik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=cambium+elevate+software+downloadPDF 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_off0000e2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E5 19792 bytes
SHA-256: abd9a38a4e9b6740ba1de53a86958d34ad28457afd24281810892140981081f1
font_01_sfnt_off000113ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113ED 10936 bytes
SHA-256: a626e7a0268c7c3733e146f134722ebf2cd64a2b1f8c6456d661fa0aadf59755
font_02_sfnt_off00012d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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