Malicious PDF — malware analysis report

Static analysis result for SHA-256 97dc5532e4a98984…

MALICIOUS

PDF

85.8 KB Created: 2021-07-07 10:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed83d22268dac9402fbdf209f487f851 SHA-1: 3ebfbd1414cb625518c33d19ff28b22ffdcad6eb SHA-256: 97dc5532e4a989842af37fd4461c1fc285c2cc14ebee17a5d141c4dc4b42fbbf
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/d0578ffcc78e377c7e6b188dcf624dc7/jujar.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608883c61d764---pubikewagar.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e910240ed0313d57f5d59f7aac0aa52d/87956884686.pdf
    • https://usssecuritate.ro/userfiles/file/34724849617.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c8aec9d99e5---2258739013.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ah86dh92t80rinacmq40vumas6/zuzim.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f34f0da48---bixuzifigogixukovi.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2a29bfbc0---viwogelub.pdf
    • https://accounting789.com/ThImg/file/wedixirag.pdf
    • https://beliangka.com/contents//files/zogigebevenexuwi.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086244c774ca---39598332235.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/7919f54217b404aea3d3699040f88ec6/69039312713.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/misowimad.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607757a3da3a1---pudagewasem.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/gv654aucdpnab9udon23mjbip7/21368506965.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ec02f11a4---filexobuno.pdf
    • https://tlproduct.com/userfiles/file/35189028526.pdf
    • https://betenagro.com/sites/default/files/file/16588465119.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b498a9c9ae9---33794997977.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=nc+labor+board+phone+number
    • 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_off0000ef51.bin
99b3cb80048bf75a472440a7486e23b89bfca742f538f0c4af9ea34ebb6e8f6b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF51 10640 bytes
font_01_sfnt_off00010736.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10736 16792 bytes
font_02_sfnt_off00011f48.bin
1c74d666d7983e582a1ed8498fe5b27d32694ac446879ca2e8df3e2621eeab92
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F48 16492 bytes