Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d10fd428d2c7f44…

MALICIOUS

PDF

79.9 KB Created: 2021-07-03 12:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa90f5aab577abe6823595990b952231 SHA-1: ffdd49b0e5975b32f88c0844e5e25abad5283268 SHA-256: 7d10fd428d2c7f440a9efa18d0ad8941b2c80c685ac1295df09586928c058a42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://fields-on-earth.com/57287865941.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760644b63cf---12864735425.pdf
    • http://zetrade.cz/userfiles/file/tiwusibuzu.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab99ba5856---bojovig.pdf
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/vedeninojodijusewefun.pdf
    • http://kaies.cn/upfiles/file/wovipijasupalatikowixaxo.pdf
    • http://stacjaregeneracja.pl/userfiles/file/27685364084.pdf
    • http://stroisvias.ru/userfiles/file/jibunaraven.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b634f1c8075---22177016803.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6dcb62839---wowetopuxiwojufug.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7374259bd---80456443997.pdf
    • http://rauvuonsach.net/images/uploads/files/46211844931.pdf
    • http://ggmtc.net/userfiles/files/31092841527.pdf
    • https://fid-data.fr/app/webroot/uploaderfiles/pefenomapinoro.pdf
    • http://megat.pl/uploaded/fck_files/file/pirizajumogififonipego.pdf
    • http://ukwoodrecycling.com/userfiles/files/38445087566.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/7be19d15e13e844b0b30973cc31323fc/zubow.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/aa2a4e721d0b14616731fbf5a2bf6d0b/39565999466.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d44cdfb6f---burog.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084731a512de---fuvibi.pdf
    • http://fly.no1-yes.com/userfiles/file/ruvidokikim.pdf
    • http://acpiindia.com/userfiles/file/89735958906.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+draw+baby+flurry+heart
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be72.bin
451bd03c728793102d66e8ca9d7234ab3fed24fde3dfc31a8f2aa02075f373ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE72 16460 bytes
font_01_sfnt_off0000d52d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD52D 16792 bytes
font_02_sfnt_off0000ed44.bin
9be6017ef92ce0c8aa73794464d5d67fefe9214e23fc1796e671810e4424451e
pdf-font-stream PDF embedded font (sfnt) at offset 0xED44 10520 bytes
font_03_sfnt_off0001055b.bin
b58f57dc1afe4b7a419b3ae8d2a87b600e286cae3b454e6826205be07def8f81
pdf-font-stream PDF embedded font (sfnt) at offset 0x1055B 17516 bytes