Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f93e0fce055c29d…

MALICIOUS

PDF

87.3 KB Created: 2021-09-19 01:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fe0a4e572aee3c256ba1d82c12f0ac2e SHA-1: 3834196d46005dcb897dc9a08bfccf28968e86ff SHA-256: 7f93e0fce055c29debe49ca60d01ef9a1ecd84a674b1fac3c5f66ebe2e9d74b5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on compromised CMS upload storage is a common tactic for hosting malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://orenprom.com/img/account/file/bizerenuvejisebaduwu.pdf In PDF document text
    • http://huemin.com/fckeditor/userfiles/file/romovuberowikarowij.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/90050505421.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/pafan.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/tutugibufovolen.pdfIn PDF document text
    • https://airbays.com/userfiles/file/6008545952.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/sebejuzowepafezokinoja.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/rajebuw.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/21248009702.pdfIn PDF document text
    • http://debten.net/UserFiles/File/puwozaxi.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/doludikixurofaziwidofe.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/palisoza.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/19905870137.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/56480426761.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/14847990515.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/verimagefopaxesozejosu.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/91478685248.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/h27o7lrletclpspqn2u3liece9/xoronupixeduxakixekaxe.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/pojafawibeg.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e57487f84a---27803811792.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/63707552785.pdfIn PDF document text
    • http://vlajamo.cz/images/file/damumuduribazarigezig.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/17832508101.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/gitixawemoxezurivimirafuv.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e75adcd429---87733375541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=zmiana+softu+androidPDF 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_off0000efca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DC 18536 bytes
SHA-256: 72394c3cfea9dc5f46e7f1706c27f72e779024187f3a230fb5c9828e10f1dd98
font_02_sfnt_off00013639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13639 10400 bytes
SHA-256: ba7c872cbe74b2833c1ec1c3ec00237b2c53629b13df06c0065d03bce07c8dc4

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