Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3cc8ea1a8687b79…

MALICIOUS

PDF

80.3 KB Created: 2021-06-25 20:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b774c32cc7e13959bf4af9a595749b4c SHA-1: 15ae624e97917df5262d8d5321661d46fae34c0b SHA-256: c3cc8ea1a8687b79c4d2eb239d5361b8a10de0864e2daf051eface2793e27dab
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, functioning as a link farm. The primary purpose appears to be directing users to malicious content or further stages of infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096d1374d511---fufegupolamuridadexutafi.pdf
    • http://oryginalnedekoracje.pl/userfiles/file/84483818807.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/422a75105732b8f3defe921803e8a64a/ronobuwuwivewulesur.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1cc248229---6037119036.pdf
    • http://mousike.it/img_ins/files/xifinalebaz.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/ct3tm720ob6c391gm08irr2u31/88142819059.pdf
    • https://cleaner.pl/userfiles/file/84912885077.pdf
    • https://gyandeepjkss.org/userfiles/file/93087771953.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10cf011de0---pazugukatemejifalalatega.pdf
    • http://jfhcoaching.nl/userfiles/files/xebivodegave.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bad37936f73---zivugetadibof.pdf
    • https://menu2uplus.com/images/file/95638977545.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d2afb7dbb---mefagenu.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903ab7a8523---3941468997.pdf
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/33881891797.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/5sq7brvrbtc927jg6f6s14iqq4/xazevepebemebudow.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c109ebe8ac5---vexasuruxinuraze.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfb9a99993---84468969665.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/ijmfbt7rkeqfb19kul6ncfh177/watuxugajuxomik.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce127e73b3---favepogokavaxo.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091c7464357b---76762057247.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/1f481e31804ca6fa9af3142fb0226abc/juzun.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072132b3e1fb---nixibinazitakigupadalip.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=home+roof+tiles
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d816.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD816 16792 bytes
font_01_sfnt_off0000f02d.bin
b23c4f28f60688c7901a04719f576fb0446867a24344cfd56d2ea4b46efde167
pdf-font-stream PDF embedded font (sfnt) at offset 0xF02D 10100 bytes
font_02_sfnt_off000106a3.bin
bc1bbe3daa4efb31be0ea540a793fc1161c58d929ebe4e568f955b71cd4edadc
pdf-font-stream PDF embedded font (sfnt) at offset 0x106A3 16992 bytes