Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a815351ce53ed74…

MALICIOUS

PDF

81.0 KB Created: 2021-08-31 11:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f69146642a3ce353ac0e1ee27abdc85 SHA-1: ee84ec2daeccd43c35c287384b3ea3dcf0209cb6 SHA-256: 5a815351ce53ed745987cbb86dd0e9580b5624826b4fcb37b9cfc9cb7c793f26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it is designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/274c1492721ff865c5c63ae8f90bedd7/90830369590.pdf
    • http://kfnmsz.com/upfolder/e/files/20210801203637.pdf
    • http://anvlaw.com/userfiles/file/mafeten.pdf
    • https://n-zvuk.ru/upload/file/48892841766.pdf
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/99507706334.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/08a391934c892ff728e41f92df2aa7b0/58373579793.pdf
    • http://szyqjsj.com/UploadFile/file/20210826074556476.pdf
    • http://goldway.jp/upload/board/file/37006253191.pdf
    • http://wallsfamilyreunion.com/clients/876683/File/7407126678.pdf
    • http://afghansolar.com/userfiles/file/63501898515.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/cd09adccecfda5f5d4ec44e315481ca7/67776467945.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105fea6db731---52868351834.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/10c4c19035bf235e1f839ccd6da96723/vewafewafupuwijek.pdf
    • https://baoyi-chuck.com/ckfinder/userfiles/files/85072444315.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0c8b4dea9---rirebokevadani.pdf
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/dopirijino.pdf
    • https://combrooncom.com/contents//files/43857146677.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086689db1e32---93294750242.pdf
    • https://arerp.kr/data/file///vupilenamutemonu.pdf
    • https://khonggiansachhanoi.vn/uploads/files/66416264951.pdf
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/52096757475.pdf
    • http://medicaldistri.com/ckfinder_files/files/kapogolabuxeva.pdf
    • https://balajihighfields.in/userfiles/file/gusekezowatuliru.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bc9752555---39047240978.pdf
    • http://barudan.hk/UploadFile/file/20210702235900400.pdf
    • https://reitinguok.lt/userfiles/file/vuruwoguweboliba.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pizza+problems+arc+length+and+sector+area+answers
    • 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_off0000d437.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD437 16792 bytes
font_01_sfnt_off0000ec49.bin
dbdd32f8db90a2945c78565840e6e7b282a0573a142e05f08084711c51ad8674
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC49 18128 bytes
font_02_sfnt_off00011b5c.bin
b2e6edcbd17c11f12d021d476d2c4051eb1c0f93913d87701de451dab7d9261f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5C 11248 bytes