Malicious PDF — malware analysis report

Static analysis result for SHA-256 471108b802103d2c…

MALICIOUS

PDF

99.3 KB Created: 2021-06-21 05:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4ec59095b9d39cb650992881b82b26cb SHA-1: 703022cb89e660f4e2acd33db2622628e7b941ab SHA-256: 471108b802103d2c2c7d8447b734bbb32da6236e087ff7be1cc42625309cb2fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9738

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://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/1b46116af1648228193016ac1b1a34c1/zedejozagosoxof.pdf In PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c25c9cff8a72f6454b8f9da0e61d382d/84687127864.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/397770d9c35611c2a0ad2d05f684f523/nevugagaxat.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a640b2dfbaa---7713879161.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed341186e7---ganetagurebemokegodilejiz.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd96c27661a---29834376125.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/doliwupafofuvakamizi.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/jamuja.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076eff6a4980---mesuxabaxaxinenutoborawa.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857d1db41dd---94674222802.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/7a3b0c14da2bbf7bc17851c477ee5c3a/rawonevur.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca1ef1ea1---kopararajasap.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/1ba04nioj7il96ku7sot8o0vdu/2256200891.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16093eb4d853d2---rusepoposafurowuzuv.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/244fa80ad50d96d10de7429c6f1292c6/miwaguwinemilavuke.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/jegureberepirerutuvora.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/307465e461fe196f3ed9307f1333e85c/dozusu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=moonlight+sonata+3rd+movement+mp3+free+downloadPDF link annotation
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B8 6988 bytes
SHA-256: cd568e23a4249e498e5fc3966de96f6394b6d5afc17d8126ee6884a8f3f409d7
font_01_sfnt_off00010579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10579 3480 bytes
SHA-256: 4bb95114b1a9ecb62634e7891a958ecafe9ab320dfc3e34514e55e21d8087aab
font_02_sfnt_off000111fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FA 5776 bytes
SHA-256: 35b667b4c28c5933cd2750b3881cd05f44b96007b183f45ea16fe79eb3a68931
font_03_sfnt_off000125a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A0 17232 bytes
SHA-256: 61dcd5e37dab362226b05aab4b1561870a44299377d7dbc43b2f6a4341b3a340
font_04_sfnt_off00015c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C61 16916 bytes
SHA-256: 299ab75d1a66b48aa247b6ad35a2d139c5836591cb2182c634efadeacdba928c
font_05_sfnt_off000174a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174A9 6244 bytes
SHA-256: 52b15efc6033aeb99ad0bfb128832dce5374dbfda2dedf3835c01cb268ab3817

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