Malicious PDF — malware analysis report

Static analysis result for SHA-256 809d808cdc2677c6…

MALICIOUS

PDF

95.1 KB Created: 2021-09-05 13:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f3df8bd1f64afb0a4090083931d4cbeb SHA-1: fa845997ce933f0d7d1b45911239797f20d8ff9c SHA-256: 809d808cdc2677c62c230f57d59d11d3a72f5cfd3f1b970c00d7708593593b7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm with numerous URLs pointing to potentially compromised CMS upload storage, suggesting an attempt to lure users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues beyond its metadata indicating it was generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ilksolar.com/Images/Media/files/67537487411.pdf In PDF document text
    • https://gea99.com/ckfinder/userfiles/files/mavoge.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce14428f2f---lepixijajutisa.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/xavudasadured.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f457b0d0b---87539061581.pdfIn PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/74538756756.pdfIn PDF document text
    • https://kompaspt2.com/contents//files/91944935340.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/09ede7f2f5e2d3129d73dfce5f9f99ad/10316415220.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/lefiwazudebabupab.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/xevefez.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/68p5q4as929f0ugkac3gie991p/460869747.pdfIn PDF document text
    • http://iwishop.hu/file/50129453301.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/61715867967.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607129cbaef4b---gupakulufanolipu.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/36aad61fc4b66094f3840e06b88b9e7f/rezakavitebumobafata.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/orij.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099000736aa8---48416999018.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/robevovuvimibedovifara.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/vuxakoraxavewilod.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/vozogafaxupofafumixukemi.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/nsa1nalqlt17438kl6vbo1d6hm/29897695506.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/8fqeue1rfra48ah2ro79l944o4/63858460324.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/b87ce5ff366195527186cfb01b3dd663/17704765808.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/bepezopinewuzudaliwubo.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/liguwewawedakufowepinevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=activity+books+for+7+year+olds+pdfPDF 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_off00010e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0D 10952 bytes
SHA-256: e3e28e61cafc9b82beb7905e927d2443897da23f8e9876305a3b3a92ace9d29f
font_01_sfnt_off0001277d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277D 18208 bytes
SHA-256: a06556486792df1075870c94a24c6bf74ee562c8ece58d7cdb007e9e34a4defb
font_02_sfnt_off0001568f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1568F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1