Malicious PDF — malware analysis report

Static analysis result for SHA-256 4924d69952fbe763…

MALICIOUS

PDF

80.6 KB Created: 2021-09-13 10:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 37d5ea02f78c01d3a31cfe5be3d7cf1a SHA-1: 646042163e3feecbd8a0a369c8c6dbed58d809ad SHA-256: 4924d69952fbe7630334f13eb11f049f51c44497aade64c5d868a6dd7060def8
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to lure users to download potentially harmful files. The presence of 'utm_term' parameters in some URLs indicates a tracking mechanism for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://queure.ru/uplcv?utm_term=8+ball+pool+mod+anti+ban PDF link annotation
    • http://geologicatoscana.eu/userfiles/files/28288542280.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/78848544191.pdfIn PDF document text
    • http://dgkno.cn/upload/jekutixifamatig.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/55075712433.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/92571598485.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/58941243343.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/49692229749.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/60658343460.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364a90348c7---10961450280.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/33285321092.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/jisosotufiwikuvafavebivox.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/roxenosofoloxu.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/jifojupabujufewukiz.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210910_151715.pdfIn PDF document text
    • https://gangnampools.com/contents/files/1347094533.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c0b995e9e---dukerosomejurun.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c56e210929---subosopojajog.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/jeruzarusinifamafosinex.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/99045374466.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/takutefobuxuf.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/xoril.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecab380f9c---8600395939.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/beruvusexumejivu.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/xirerobosezalivolil.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/fidonosi.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_off0000da83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA83 16784 bytes
SHA-256: 45367eafd3a9a0401d32a39618e32d1eed0aee326b4b3ccdfd751861c57d4ec9
font_01_sfnt_off000105e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E3 10404 bytes
SHA-256: 9677248cf4b52cb2f0b7ff311f24eed0e0f5879fdfc8b51401de7dfdf309c43a
font_02_sfnt_off00011d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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