Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd279adf26805dc…

MALICIOUS

PDF

85.6 KB Created: 2021-06-30 17:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9eeb7f146b8e863a3942aeaf8803808b SHA-1: 236e3b1701318271742f855dcce4a82c5553706e SHA-256: 7cd279adf26805dc0075360e421ada6ff21c1ae981dde1b4c66478d2c2b67d3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=optically+active+and+inactive+isomers PDF link annotation
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5320fc2fe9---68802993222.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c76563ad23---43068419076.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/a9f941b759b3f0bfee31d20b4648fc56/fevudifajed.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fe4431868---nakiviwosaxuvafidazaw.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160892ac5e36c5---jenajagepexinapum.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/kigedogikizoteputixiwariw.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/madabeweb.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/dcbe2ca1733fb6ba3e36a7379ddcbf73/13250131199.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160757a75d8478---wiwalanuvuxobozunukowuv.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210626013011.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/pedeluzemumavopuvodufa.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/fajusixafe.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/zeriravegawitabez.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160787546c9740---wakejidadelogo.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/5052553121.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/ijjod1k9098hidc30ueqc8e5nr/38992017857.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/ridatuxepomevuni.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/2db808ed540f5d65e83f1cfe8ecfbdd0/69669288790.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d88dd2f69a---62781010486.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/81949545031.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/xikedimi.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160866d78780c9---wojubalezobegimubajupowo.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/duzinivageniwifirego.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/j624anf52p78o6uuokdj029967/38940449848.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/vimimipusenodadi.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_off0000ea8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A1 10880 bytes
SHA-256: 874ff5819cdc5eb751a346a1729bd1a0faf9d0d3bbceb9acf5914219e00e1233
font_02_sfnt_off00011bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDA 17180 bytes
SHA-256: dace9a18f91fe4e077d9f8ef172fe571ddd7b100d13a029f171126875f80c17d

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