Malicious PDF — malware analysis report

Static analysis result for SHA-256 7289ae25b199775c…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 04:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cdc26cc7d4b29f799d5c103293cbed23 SHA-1: 05347ded9aaeec250a45a24a945ba13b7ae5ae88 SHA-256: 7289ae25b199775c4f59d52a3d30f371de808baa691f9ae74684d24239c15762
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 WordPress sites, suggesting it functions as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608199c78a3f5---12565655175.pdf
    • https://cecprint.com/images/file/98155700804.pdf
    • http://zsdbiopharm.com/upload/files/27385279308.pdf
    • http://szentimresiklos.hu/upload/file/xuvane.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc631a8be4---vivifobumew.pdf
    • http://thuocnam.xyz/images/files/wiruwijabolez.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095f5486746c---8446133435.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/d29a1190e77f14a4ddbf7ccdfabf4fe9/96898275564.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/e13dfb88c4267ee6c7c697d68067c810/84991294340.pdf
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/41865361216.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609076f50c887---jiwuwatitapi.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a63dda598---47890359729.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/2aeebbc10e2addac50b3772977525ea4/xivoguwukubekunu.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ce22d89f41---nuraviwoditibizisemixudo.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4ad3df539---31605911513.pdf
    • https://robodom.si/files_vsebine/93636054174.pdf
    • http://lueckerreunion2020.com/clients/e/eb/eba09433058400eda594a485f9004317/File/90989545675.pdf
    • http://dietetyka-24.pl/images/files/46993446604.pdf
    • https://la-klamm.org/Files/files/kufesunuxavesopiwid.pdf
    • https://ehotelgateway.com/bot/ckfinder/uf/files/wowenumibetutude.pdf
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/zodajovepil.pdf
    • http://ronaldtan.nl/images/photo/4141418301.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=water+pollution+project+in+bengali+language+pdf
    • https://medlineplus.gov/waterpollution.html
    • 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_off0000e13e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE13E 16792 bytes
font_01_sfnt_off0000f950.bin
e861f782887a17d482744d34cb04adc258b57d583b5e1e96a3c2d068409b1610
pdf-font-stream PDF embedded font (sfnt) at offset 0xF950 17024 bytes
font_02_sfnt_off00012587.bin
ca1331055676f2fc857989bed82ddc7ca123104d510b20fafa329e8bc5808165
pdf-font-stream PDF embedded font (sfnt) at offset 0x12587 10988 bytes