Malicious PDF — malware analysis report

Static analysis result for SHA-256 9171be141e5d7649…

MALICIOUS

PDF

75.7 KB Created: 2021-09-18 13:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67eb36ec65f0d592598de4066457dfca SHA-1: cc2f7eb445ec02dccfb07b7204e127e7978b6786 SHA-256: 9171be141e5d76498fec61a4fae0f67df44e853e603dd58e840758f771fb57e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to host or distribute malicious content. While no scripts were directly extracted, the nature of the link farm and the ClamAV detection indicate a phishing or malware distribution attempt.

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://beautydiction.com/ckfinder/userfiles/files/xagufuf.pdf
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/75283332430.pdf
    • http://leasingtowers.com/ckfinder/userfiles/files/rofepusazug.pdf
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210910004535.pdf
    • https://democv.associasuite.com/imagenes/contenidos/files/muwunutegufobel.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16145c02800dd1---bezatapederumorobamurog.pdf
    • http://cambresisemploi.fr/ckfinder/userfiles/files/22253484250.pdf
    • http://redondoclassicburger.com/uploads/files/fematujitoxilepuwulira.pdf
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mijivoxopasuzoxanefe.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/7648549a335bec32ae14567fb0178bb5/9100281109.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c38fc324e0---kezevuluzadofebasojod.pdf
    • http://chongthamphucthang.com/images/news/files/fokorewuzogame.pdf
    • http://papienbanana.com/user_file/file/vumimamoduzotebo.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372cb0c9d6f---nexafejunofubajewobotaw.pdf
    • http://srmtteaparty.com/uploads/files/202109180300479398.pdf
    • http://studiopiergentili.it/userfiles/files/23327518770.pdf
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/geputopiresasuronubi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613921e2f1f5b---30750359292.pdf
    • http://www.bsa.by/ckfinder/userfiles/files/57752215859.pdf
    • http://watthaistuttgart.de/userfiles/file/pototagufudafakaliserux.pdf
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/25908406489.pdf
    • https://atlastoursntravels.com/userfiles/file/95985426947.pdf
    • http://2222.netsociality.com/upload/files/7037220796.pdf
    • http://sinhorelli.com/userfiles/file/26436504775.pdf
    • http://stelmart.ru/userfiles/file/6367304870.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=where+can+i+watch+my+sister%27s+keeper
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c093.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC093 16792 bytes
font_01_sfnt_off0000d8a5.bin
ea303ba67cea190b644b506510e14be67e50806b9d233241eede88706e75aeb9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A5 18236 bytes
font_02_sfnt_off000107e7.bin
89003a1d3ec71a6a7fb0ccaa68cc2f21098e97de0666dffe508b99995188cf52
pdf-font-stream PDF embedded font (sfnt) at offset 0x107E7 10792 bytes