Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d68ee6836190ecd…

MALICIOUS

PDF

125.6 KB Created: 2021-07-23 13:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1919e098a42c5013ad76ad69bfbd92d2 SHA-1: 3cfe18c58d9287ef660fa52b184a23a9a3e26f15 SHA-256: 4d68ee6836190ecdfc1aabdf8d7cbf2c8a7d364a67177a48bb17cf451e75dfe6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The PDF structure and numerous external links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://marathon-gexin.com/Uploadfiles/files/mazeje.pdf In PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/cd6cbadaa4415b8abf2d067007e63578/34493612485.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/lapor.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/8f38c9f31090bb1a872a44d862db23b6/majan.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/famowosenur.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fb108435e---dajonimalemikuvafenileg.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909b5532374---35176626354.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070be03990b2---belujizejetesu.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/filaniwiz.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/17338220135.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768076c53d9---zavenuzikigokupanemomojud.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/3e3f8b39e910abb8e5d9a3e7ca381001/zaxokakidataro.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28976844296.pdfIn PDF document text
    • http://silverleafspa.ca/clients/10619/File/mibakasefisowuwowitoj.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/b982d900c5dcafcb6f93160c780b868e/69903604331.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/pififomawujatuwifut.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/0f3a92d838b1045a093f17242019d27a/54375264835.pdfIn PDF document text
    • https://artbynela.com/uploads/file/95790333829.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c18526228c1---34445591496.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/97485449806.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/f5a030761db670a0caed1e084f0eda22/67377448822.pdfIn PDF document text
    • http://immopolignano.lu/images/gumerux.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/bukomimidokozikega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=throwing+knives+like+a+properPDF 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_off000187fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187FA 18132 bytes
SHA-256: 79a349c696b8d21816d2a09ff965a56719b902ef0e39d724b79ca2872f4c2471
font_01_sfnt_off0001b727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B727 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001cf3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF3E 10640 bytes
SHA-256: 37fbc5b5be0b90ff6e6fd25f8ba746b1afb19d39ada5de8ae6a49c8159747bcc

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