Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac22799f12449035…

MALICIOUS

PDF

139.9 KB Created: 2021-07-01 00:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 461c476671342dff8641d6e0a79cbdcd SHA-1: 0b8c9fa9f66680113126bbe8326756f54c145891 SHA-256: ac22799f12449035399cd670dbf9f541f7ab4f4eefa031edf82601374cfcb539
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites through a link farm. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

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://servis-hradec.cz/files/file/nerixutugakozebokire.pdf In PDF document text
    • http://gancza.pl/userfiles/file/28555003343.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021061223545980554.pdfIn PDF document text
    • http://askort.pl/Upload/file/wobulesidifevaxi.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/wijufizidix.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6c255919e---jejosememubuxogenetariwa.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/36lbcc4d9hv7gh63cj5toou28d/wetarivogafixedopiwogisod.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609618f3c7e28---sezavoperovokek.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b78dab79d---mixodavenoninepugefazupir.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/ronosifarevep.pdfIn PDF document text
    • http://chongros.com/userData/board/file/razefulejulipudulodab.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b4aaff0e39b---wivomutulemagawal.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/l73r7ns5acpkvos622g93fa2i8/46492436516.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/uc0lp9dkcf2kab00agg8bbbjb2/dozubimotoxi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160865d7bd39bb---xurujovogag.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/p3v7nqrkv5rvme8b8bgaotmogv/famanomuweta.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6674d3bdf---jutapixulonubivagizej.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/9917381677.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923ac1cf6c0---14172109422.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d84c41c09---59035250434.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/60924243554.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b22c1ba9067---bufogebataro.pdfIn PDF document text
    • https://airbays.com/userfiles/file/sepedalepokaropufetetawul.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/u1p3oeourjhve0raa8ecfbpp00/30686499789.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/24882621279.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/280133244556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=types+of+introvert+personalityPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a5051cdafedc22b2a66dc587fe265da6/nuwejozabadububeri.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_off0001bfb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFB7 10496 bytes
SHA-256: b5416c25ccd5cbc5711d0668356a52747a983e6370035d1ececfbf1dce54146a
font_01_sfnt_off0001d7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D7C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001efda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EFDA 18932 bytes
SHA-256: e532429deac21ccc1b97cae1bee6ed8e97f57cbd966d5b154a9aaa916e1f5fde