Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55533b282149380…

MALICIOUS

PDF

83.6 KB Created: 2021-09-13 18:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b513d1e5dfa69f136f83122e9519bac1 SHA-1: 7c1a231e1b1fe0d3114f5cdf570baa23cfa7a071 SHA-256: e55533b2821493807cefdbd7229a4f941e5a91df21f14468ef1689ea56396501
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable domains. These links likely lead to phishing pages or further malware downloads, consistent with a malicious document lure.

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 https://inwebjor.ru/uplcv?utm_term=on+the+open+road+book+pdf PDF link annotation
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/eda1d7653708832fb5cf1804ad586741/55798766360.pdfIn PDF document text
    • https://laps.pl/userfiles/file/mirolafuxivirile.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/lozij.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/kafowapanaj.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/memubiwozelutegobudovez.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/37097896424.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/topon.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/58423277558.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc201a7e13---78996876217.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/jafen.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/xogok.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/vabuxu.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/kuvutomigitevuvalijexafu.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/foful.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/jotanozokabipuja.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/74295958937.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/22405701332.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/53924029719.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/fixunexemi.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109130750518082.pdfIn PDF document text
    • https://esvigo.com/upload/files/ropuzipevu.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/70356146679.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/16005452176.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/velugofozusug.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/gopb9g56km8rhhe7lm81863l2n/65878930463.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/30989067559.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_off0000e34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB65 10544 bytes
SHA-256: a438a169c35168efdaa38df36b988471b5f90edb0e5d687f77a085ff5e398952
font_02_sfnt_off0001131a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131A 17696 bytes
SHA-256: 472393faf051d252ae1fa99fa8ef3daea2991b0f8ac33fa6c0599ea52828c26a

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