Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53afd00554152c5…

MALICIOUS

PDF

72.3 KB Created: 2021-09-20 21:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 91a0c2a9f56e4876317c8a32024a9fb9 SHA-1: 8e201e277bffa5990a2d2fa355648244047ea98d SHA-256: e53afd00554152c57886a7cfe09e9160a3c123ad305306c0c65f5c31990315e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs and is identified as a link farm, with several pointing to compromised CMS uploads or disposable hosting. The document body is unreadable, but the heuristics strongly suggest a phishing or malware distribution lure.

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 https://garglob.ru/uplcv?utm_term=subway+surfer+unlimited+money+apk PDF link annotation
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/77317171051.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/74db4b111c435ce695e3983367b0bd9f/3456167765.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/37485268868.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/77383010288.pdfIn PDF document text
    • http://jinyezi.cn/upload/degegevokata.pdfIn PDF document text
    • https://bnovum.hu/downloads/bevunutuvokepifiw.pdfIn PDF document text
    • http://teresachild.com/upload/files/digajusul.pdfIn PDF document text
    • https://e-room.co/userfiles/file/64195535491.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/mijixomifukilunusavidowa.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/durepefodaba.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161414b82e40a6---65861089645.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/49380573298.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/4aec6514c0c5d8597a3e659f8112796e/9417009678.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/bosivadib.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/faporemetisinepamewepotox.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/nudizegababolexipedoz.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/zozanuxeditokorexadoviduv.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/jikirixawofigewata.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210917113423.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/48695259597.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161481fda20eed---12045941431.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/xabozapidumivef.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/mibubitabumeripuka.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/nafasimenojivateza.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_off0000b74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB74E 16576 bytes
SHA-256: 661041227720ea7bc151474a1e2c07795b7bb1bf845ab5d7231f0cb3f60814ce
font_01_sfnt_off0000e112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE112 11264 bytes
SHA-256: 41bc6867993b6e413def3c0a1bf309442e0a0907b710141c53b24be642133b3d
font_02_sfnt_off0000fb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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