Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8c50bacd104f94…

MALICIOUS

PDF

81.4 KB Created: 2021-07-22 05:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6ef9ca0f00f4eb089f9b1dc046761d5d SHA-1: 548ab68baad6509a81af4b610787caaf0c92c639 SHA-256: bf8c50bacd104f945ca8579c6a7621d94e3e375f78500cbbc66d5ed4df19a254
156 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The PDF structure itself is also noted for duplicate object bodies, which can sometimes be used for obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://jngf.cn/files/file/61820511188.pdf In PDF document text
    • http://amuseonline.com/absite/userfiles/file/govuxasugola.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c2df9f7a5---4806818573.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/47629608237.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/81f6d370ea37daf1e096e7b0d64e0af7/bokowifixerugikasojafa.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/jipeworulogegefefori.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/bigibanowe.pdfIn PDF document text
    • http://tulga.ru/editor/files/bogadumodud.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/73959750089.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/87837052542.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e7c09427441---80992680579.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06a55d2cb8---fibusapipapuzezogu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac83f879ae1---ruxemabazifewabumeduxux.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160997efb43918---69103480113.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609adf0d65fd8---sadakiduxiwevatid.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/76318678025.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/84ca27bbc764b6e9d495aec9d7bca8b8/76764007535.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/fisoxojilosodetel.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/97a6d56688da6b42c94bcfe959247c3c/95330896936.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/kivir.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608df937e5870---75839940611.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1a3caebb5---45950683040.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/zopigimerusafewepawaxukow.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609996fd6d40a---gegotuxotixizoge.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096a785dcc1e---78770378293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=covalent+bonding+lewis+dot+structures+worksheet+answersPDF 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_off0000d8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CC 11164 bytes
SHA-256: 8d5541f960a8fa604225c3286a318046bf24b0ca16d984ec657941aaf4d84cb0
font_01_sfnt_off0000f2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BA 17196 bytes
SHA-256: 978cebf68817f1939974ad515e3b9e7ecb3ebdec84e0d84434baae6cbadb2581
font_02_sfnt_off00011f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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