Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d2028224a058cf0…

MALICIOUS

PDF

79.4 KB Created: 2021-09-05 11:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 18fa8eeaa98a2a14d2938a234e3e5eae SHA-1: eaf6a2945de7e3f4291e594ea277ef25f029fc0b SHA-256: 0d2028224a058cf0c2250cccb99a53f11679868559ae94d1e82d8a7fec0b2fce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=statistics+worked+examples+pdf PDF link annotation
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/554b89df34f223fd2db2fdf88a3e00a0/82367687880.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/62758564413.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/00c5c975003e1bb3e60f4fbf56849e5f/90292841933.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/68227855623.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/gubaketevorasotuwupi.pdfIn PDF document text
    • http://jinyezi.cn/upload/nebagapumuvuk.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cc76bc96b---famukexawazakekinupudel.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160aebc7eabb65---verojofewosijajufo.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/dojapufiwalelimekig.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e085d3ccb10---vijezageleragi.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/wobuwobirok.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/72603203993.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/16778021776.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/20208439455.pdfIn PDF document text
    • https://digireg.pl/upload/38295324918.pdfIn PDF document text
    • https://tigapilar.com/upload/files/63192923926.pdfIn PDF document text
    • http://josquin-capella.de/download/83307704341.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/43452480399.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/0829dd55d55bd67000c7393123e5d759/24328510895.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/9dbc6ffe12937ac1e785b082c410f3a9/kevidegulowipiva.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/boxulo.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/wavetogojivunekusijevarok.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d03986c43---28765268981.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/62c0aa7fc5e36fec637f86ee0e6d4e0c/31391997746.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_off0000ccee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEE 18568 bytes
SHA-256: 4119cfa7f02c47a6255158c95a239a8617c5fcb7aa75e9665eba2cfe884a8b78
font_01_sfnt_off0000fde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE8 11032 bytes
SHA-256: db8c09ca5dc940c18293d49d269f0707993fc37688bc1f83253ae266a2752bd1
font_02_sfnt_off000117ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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