Malicious PDF — malware analysis report

Static analysis result for SHA-256 b01bf368011df14c…

MALICIOUS

PDF

94.0 KB Created: 2021-07-29 17:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: acc24c61467d6184dae2afa69555bb91 SHA-1: 65244ddf6cc620ffb38d385fd9644921a6637b89 SHA-256: b01bf368011df14c378e018160a5ecc4fbcbed18244be776349e19605227b317
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://fotografoenricogiampieri.it/userfiles/files/rafuwe.pdf In PDF document text
    • http://www.contectrade.hu/fckfiles/file/turikukiledixunabukogu.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/35402824483.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8e0705182---wapopilomazonaxexubojux.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d1aae8315---44086141627.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/46165502660.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/wadatutexeluputemovale.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/parezozoxepotowu.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/43740753001.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/gumeposonokisawetavo.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/6171df1972aa4f7ac3a620dbb5ee68fd/66611796688.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607370ed55647---mugutinunufanepexobowar.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfddb4caad---13746190108.pdfIn PDF document text
    • https://migger.dk/userimages/file/tuxojizisev.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/16875695401.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/92445109985.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/verabufevep.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/lekirijidakelisexunedewi.pdfIn PDF document text
    • https://actor-conseil.com/files/file/54442635184.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b004605c0e1---49789832873.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d949133b6de---wolewusokalosajuwewewo.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ujbs1g5kod8faee6it7udp8oru/85146452214.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607019c678497---45254719400.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/32868755760.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/3465933206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=google+sheets+v+excelPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AE 16068 bytes
SHA-256: 6d636ebcb28a43c11a0b96216d988d0aaa25e428b847d4e039b2a2a6b6e27b6d
font_01_sfnt_off000108cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CF 10256 bytes
SHA-256: 917480a05025e544f20dae3210622f8334aec7014a29c147e40b08d6d65dcd51
font_02_sfnt_off00012021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13833 18724 bytes
SHA-256: d6a3666819965feefd54a14d0560e3076ddd7ed25f1d8b1c20f4b283c6a39e9d

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