Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa54cc8060bcd36…

MALICIOUS

PDF

110.4 KB Created: 2021-08-31 18:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d97f23ae38d777cfe4f0a19721ccd9a2 SHA-1: 01a6db06eadba1218d2ce060561702d316b4ff7b SHA-256: 4aa54cc8060bcd3612e6b96264a0d059749d8f7cfb5af10514f50f00822518af
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites, a common tactic for distributing malware or conducting phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23042632116.pdf In PDF document text
    • http://cobansut.com/userfiles/file/96651743004.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/nidorerakuvemi.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/88935005210.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/zipufakemekax.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/d30490faa1c67e9e227f9edffef8dfde/tobibirenopadix.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/9c3bea6deb8c15016c6deb06b1edfe75/41673492386.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/750a626b06760f16b30f750811f3efc9/12195589356.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/bekikoj.pdfIn PDF document text
    • https://topaldanang.com/uploads/image/files/80811494736.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/dimositinun.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/gcmm7euoclu8cmasdgc0kj4rld/16221994891.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0367560001623993307.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b792b99e4cb---susewegoziverimujimadi.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/49jn0nle1jrmprlpt8rsjeo8m1/3058017466.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/xezedavonuxopavigafolo.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/e3176680f7ce81285ef8e08f68bf2d4a/gejuvud.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/29578920026.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/lipizeroredoporufelebudu.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/nulazu.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d58703b3b7---27751323385.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/21026900635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=psp+games+free+download+iso+filePDF 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_off00014adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ADB 10828 bytes
SHA-256: c8fede5076c0ef8ff5f4f98d5f602b72bc2d1086185d2a0cb9a5d8fa9039a432
font_01_sfnt_off00016399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16399 18588 bytes
SHA-256: dd8722d9d270b117a924d9d015ff59440ac78f0cc43ee9104a0988b4b0d23b9f
font_02_sfnt_off0001937d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1937D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1