Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee49ea08224bfcda…

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 00:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 385f9087a80e8c962bcaf1a50184261c SHA-1: aec5a0480a6718490171d06fcb595daebd553a76 SHA-256: ee49ea08224bfcda4163a52dbdc5385c0eed137340088f7a95549876dad98577
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS upload directories. The presence of numerous external links suggests an attempt to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://muzpony.de/obrazki/file/posaninu.pdf In PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/mrhle2q2jiacvhfgp4rcklojb6/28137455858.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/xavel.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/55182097872.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/49253761542.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/fidejepijefidori.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/dekatanazaso.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f71c95068---duxivimigeziruj.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/tosivabo.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/26940414520.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210904153416_gj3335.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/vixozo.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/vojanowinixepo.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/walavenikelaparodin.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614407673f5af---53203737905.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/ganewodototubasutid.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/49543666429.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/79095848575.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/gaxuvufepalozute.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/99kck0h96q3fh2t6gd09n2n9br/9149274234.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/suxazeresomaj.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090623554899.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/virafabikavasinomenamile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=samsung+galaxy+s21+vs+iphone+se+2020PDF link annotation
    • 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_off0000e668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE668 11252 bytes
SHA-256: 5bd960d53810fde45a4b7eb52a2472b2cde26a750b44c69794e61b0e20c9fd57
font_01_sfnt_off000100a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A3 17736 bytes
SHA-256: 51307835d638031d25f31a979876a4f9ba81ee6626370ef346c6db136e8a985f
font_02_sfnt_off00012ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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