Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c513e7966b42dd…

MALICIOUS

PDF

96.1 KB Created: 2021-07-03 09:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 80b1a4b550ada1d08901e115c0d914e9 SHA-1: 7ae0a6b0359a5b6bc4cb57cc026a5c204d72c40a SHA-256: 65c513e7966b42dd0e5db3813ef7b2911ee1b24d51bce55c6e94d4136f8f7e45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload storage and other disposable hosting, likely intended to distribute further malicious content or phish users. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://laborke.ru/uplcv?utm_term=energy+produced+by+moving+electrons PDF link annotation
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094030b58767---95468556794.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee8a31c4fb---favigutabarube.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/9c3547c7afeb4e20794f4ed64ff89e96/22118401109.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/51201194824.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc190b302c0---vepotepevofolifu.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e4b644755---vejaxanuz.pdfIn PDF document text
    • http://njnccualumni.com/clients/0/05/05b55d2c4c342460da0dc2f503861b12/File/366225975.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071b361266ca---36341706891.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/571105514.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/fudavus.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/jedapokosebenugebina.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/labusotogojorubaj.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/2ba7e7a9e1ef48fdb016080e65c09202/45164498553.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/fifukeripopetokezob.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/28043217940.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/84018673195.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31ffea6c6e---18412151449.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608836188de16---fugazijexa.pdfIn PDF document text
    • http://amdind.com/userfiles/file/jipisebeva.pdfIn PDF document text
    • http://wenxuezj.com/images/File/dasinarilozisufuxaf.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/pigama.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e8121b039---vewixenovelujazevitisez.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/palemezagimodaso.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16085c6f23f3f8---33503456899.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_off000114f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F9 17040 bytes
SHA-256: c724cee13778adf283f812753ccd5e7d60bb8294c536e517706c7a5bd5ae6201
font_01_sfnt_off000141a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000159c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159C0 11100 bytes
SHA-256: f48e98f556943527b77ca3de777e1abca0af3eaff23bef92792baefd5ac45fe2

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