Malicious PDF — malware analysis report

Static analysis result for SHA-256 d976e4e24f573ea8…

MALICIOUS

PDF

71.0 KB Created: 2021-09-18 12:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a32ac7c712f17e7796c739e2e87d8d05 SHA-1: 72f7c96f3fe200cf2c3ddb785e11269adca3959f SHA-256: d976e4e24f573ea8f57166ebb3f4c2cd578e293cff1342d4331b670edfdf0e6c
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs, several of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://z-i-f.ru/userfiles/file/tasomulo.pdf In PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137cf7191a4f---61057384042.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/98881198352.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/fizusumajuzezog.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143162838689---videtujefatuwedutuwivotaw.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/246926b45084b087c812131df6085c76/migegobuvud.pdfIn PDF document text
    • https://hinaweb.com/upload/file/91853346457.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/detadiwow.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/43447598315.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/af6f272b3564cbd875f74140a75db00b/fizavabowedivilebivag.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/zipugerarivolupixi.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/17472246533.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/202194141435821.pdfIn PDF document text
    • https://znalac.com/userfiles/file/90747885076.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/bozisotumamolowigixigaj.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/96177811580.pdfIn PDF document text
    • http://loxocongnghiep.com/MINH/user_files/file/86365372389.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/nufozemowimomof.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/73a951c1fbbd1e8335c764712c77fadf/lanuzokop.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210910134502.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/pararuwelosowofasod.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/vuvalufilikexulijowor.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138320f819dd---73448259037.pdfIn PDF document text
    • http://caythuocnam.org/images/files/sajozukalipiliworaxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=new+english+file+upper+intermediate+teacher+book+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_off0000af6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6D 11460 bytes
SHA-256: c6c4bc37940e1424bddae93109cda4f56abe9bdf6ff36ddec6ad76105ece1d2f
font_01_sfnt_off0000c9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F6 17048 bytes
SHA-256: cafa2baec941f2034b4710b2d82eeafe98711ddf9827fa6362fb4799a8e2fb5e
font_02_sfnt_off0000f5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1