Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12784fa335fed77…

MALICIOUS

PDF

128.1 KB Created: 2021-06-18 11:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0b5a23c2f087a06884eced3c48a59f94 SHA-1: 521f58fe54f1cbd6f18aa7e655cbe77fec7264ee SHA-256: c12784fa335fed77414f3805103dd29436ca1c7158f3b3a888034207addc358a
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 0.9992

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://shuimotongyuan.com/userfiles/file/gujoxapokolunolet.pdf In PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/hj2q8bup63ajjk15mk3r8c6sgi/2956690093.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160917631c67f6---fipebugetosinikibutosedu.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/bitel.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/99912359097.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c203f577c73---xusuvazepu.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/cfjno1i69ig8cmk7d0j6fjt4ht/7555845566.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c2e0421eb---nivozifubene.pdfIn PDF document text
    • http://feast.to/upd_file/20855724978.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/pisozesuwefu.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/lemipewikekalovajulegod.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3acae820b---popuxenu.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d5f825a17---tepaxopozoditor.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/najadakuxipaji.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/tupokanag.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/bufojivofoxevutekalij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=grand+summoner+guidePDF 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://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_off00015fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD8 11444 bytes
SHA-256: acd2db8f209fa6757d228e7804b1ffb7a12cc26b9184ced9fc3ab61df529e7a4
font_01_sfnt_off000185bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185BC 4948 bytes
SHA-256: 0970644c0048a14eae8fff608458c75ac5bdde59204375856e5cdec53aa9e179
font_02_sfnt_off00019662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19662 3088 bytes
SHA-256: c4ae04fd1fd47807f1abc7eec47f091f320fec06cd1ec70f00f35acddd628aaf
font_03_sfnt_off0001a34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A34C 13888 bytes
SHA-256: b39a7d7cd72cab6eb4c7c54bf3e8e1b805f77e991df78ac4e0a761a9b7947669
font_04_sfnt_off0001cfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFBE 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940
font_05_sfnt_off0001e427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E427 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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