Malicious PDF — malware analysis report

Static analysis result for SHA-256 eecae400cd424eb4…

MALICIOUS

PDF

89.3 KB Created: 2021-09-07 05:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 2b9cb75045a55a294efe5efd12a16fde SHA-1: aa71009c8ea17b32f5faec808878b0a4ae176c16 SHA-256: eecae400cd424eb4d9a04371a39ac63946744b5bc7e783f168cf00f8b91abd36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9973

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://flirtproducties.nl/ckfinder/userfiles/files/48755427994.pdf In PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ad64a3475---64209107992.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160870b81e040e---daxiw.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/27558205620.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/saredomefupisilofobopemi.pdfIn PDF document text
    • https://thepainter.asia/upload/files/67488622168.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cbc13f143---vopamovudamagemij.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1cf30a190---wumimilokokawodoxe.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/38324480888.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/wamasojivomupizawiwot.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/sobagasojiligofasugu.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/93248506532.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210623095046.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/4198214100.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/61884020726.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1df99086ae---jevibuwilupabugid.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/36256214176.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/13213d19676a9b6fda1385e8efb04a15/51113390356.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/81343188223.pdfIn PDF document text
    • https://press-centr.com/images/file/8164693819.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/65836067969.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/djbc02ndk2sghj4sh4k2bhutsk/sutakoviginifugo.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/jevexibavuxexaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=numeros+positivos+y+negativos+6+primaria+pdfPDF 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_off0000ef27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF27 11220 bytes
SHA-256: 220b22c61ac24e1bb7f966ac0b602c97efb01c7f46c7334d7f4790c671300694
font_01_sfnt_off00010954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10954 21056 bytes
SHA-256: cec451fcf70a988195b8d1add68f26e93d6f80e6ae26388de87925a041fb8a46
font_02_sfnt_off00013f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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