Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51fb93c1adf80aa…

MALICIOUS

PDF

88.9 KB Created: 2021-06-24 21:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c2613b3db061a3b013c032fdfd93b734 SHA-1: 4f0137429b73230db75d63057e3dcfe03d7d2ec6 SHA-256: e51fb93c1adf80aa36a04df948726941ec42a468209a09c31c63c5cae110d0fe
156 Risk Score

Malware Insights

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

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 0.9995

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://ketchas.ru/uplcv?utm_term=11th+science+chemistry+book+pdf+download PDF link annotation
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088230ea3154---jonap.pdfIn PDF document text
    • https://luminex.pl/upload/file/matemamijaxoxozutababukow.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/17424630312.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/0a9cab995c63b7cf3d833196b06eb442/97969668960.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160909b07c30ce---pevanitimakalagad.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb3d5165bc---zerifegebirekinek.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/33642878094.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/fb87933a8b48bd26d1e55acaf91854c5/74394819332.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/ae1493fe2db062bfa86bc4f47c71220d/pulim.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/41235692128.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/f6b1b7110e79843428000f81e926a426/jusalowuv.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/9uven9fh6kpap41bkq41ob1ak1/30074543028.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/95370aac9c1f2bc78751b76b593f29ce/rewipi.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/763df7910cf78e3d7c9715a8a92eeef7/zobikamevetiru.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082efbb27741---luleju.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/femefik.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/4847569aa2e378d61547c30ec773813c/gazul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.indictrans.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BF 5540 bytes
SHA-256: 4b569edd44640ceb4b8fa70462cbb9da945220037c5a6e2a11bf54edb7d86b99
font_01_sfnt_off0000f562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF562 9324 bytes
SHA-256: 3d4df19beeb27c43840e81f10c4ec545b426e36705fddeeb40bed0698a065cd8
font_02_sfnt_off00011397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11397 11220 bytes
SHA-256: a7aa7c4de0662dc14ab46925a2a4b614c6f76cacfebcd0170243e685ba10a221
font_03_sfnt_off0001399f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1399F 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
font_04_sfnt_off0001479f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1479F 3416 bytes
SHA-256: c43737fa03ba336784777fa323e495003b05a5408f5be2c13f30feaa3cca224d

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