Malicious PDF — malware analysis report

Static analysis result for SHA-256 39fdee6981cc62a1…

MALICIOUS

PDF

97.7 KB Created: 2021-07-19 04:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 05002f42ba9274590cf5dabad9a37a4a SHA-1: e36b998faa4a32806b72e921be003716d0521039 SHA-256: 39fdee6981cc62a1b82d6929f8c219c814e3e493b9b6524675e7f465594a0be9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, possibly leveraging embedded JavaScript for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://africanresearchcenter.com/userfiles/file/14610730921.pdf In PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c3237fae6---pasiredikenidiwep.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/mogipexanuravexezogiti.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abe171897d4---32061597005.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/selewofekenuwosoteboj.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/acb1973957c8dd9ffa439754e5b02510/36491045334.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/97958018911.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/mezar.pdfIn PDF document text
    • http://thecobbfr.com/clients/4/43/4363d5a08aa72aedcf7f7d4dd0675897/File/20749531747.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/49002722721.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/aee8301d1240280442fef8b4cd3e36e8/jaladupuwadiwuditonutowo.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/befanabit.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/87916013321.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/puwibajori.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/80235498933.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/zukorasatowagezogisefexi.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098315c4bc8e---83639005751.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73f1bc5a9e---pojirewub.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f68b53f554---11087934091.pdfIn PDF document text
    • http://fittbikese.hu/files/file/mozudezeruri.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/ctfqsg0q551s2beooetontbvi4/52022370015.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/vekanemido.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/86787894259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=introduction+to+artificial+intelligence+and+expert+systems+pdf+downloadPDF 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_off00011a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3D 16888 bytes
SHA-256: 7840d4736701ce4f68ea8df68ad7eb0e5067f9cd73b695101298fe8f645ef154
font_01_sfnt_off000145fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145FB 11316 bytes
SHA-256: ebb2ac8cac73a0d05c3f74eee060a65470984ad952c9c6be3dd93c7fc22fd687
font_02_sfnt_off00016079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16079 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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