Malicious PDF — malware analysis report

Static analysis result for SHA-256 410baf146ef1270e…

MALICIOUS

PDF

89.7 KB Created: 2021-09-01 06:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ab9e8fc82689fb3ee479d8b338e4f93f SHA-1: 8fec7db2eca6fb65fa1306b0fc738b43226c7211 SHA-256: 410baf146ef1270e0a86660a40bf063565559eb52c438149044baf0336af4700
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised WordPress installations. The presence of 'utm_term' parameters suggests a phishing or SEO manipulation tactic, aiming to lure users to potentially malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=add+cover+to+pdf+kindle PDF link annotation
    • http://old.smartplus.pl/ckfinder/userfiles/files/vibugoweze.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/panidoje.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161238bc83bc42---moxulupuzezobugumaxowe.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1623104499.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/gafojopaxorafifesevufeliv.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/8df1d72c9d3c6894642e9ad097f64a27/23815939724.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/80483447367.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607584928c185---32730847506.pdfIn PDF document text
    • http://starrsgazette.com/admin/images/file/77788177763.pdfIn PDF document text
    • http://landpas.pl/upload/file/82475847798.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aae78e775b8---pewinatudofugife.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/nudifeganizupi.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c369cfdea---19821381099.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/92652804819.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/kesoxuxetadixagak.pdfIn PDF document text
    • http://gumberryoleschool.com/clients/33891/File/99149186539.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/wovilemivikaparesusifogi.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/zabaxetuvazuzuvimuzexa.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/50209596749.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/l8576vet7k71qkm0j4l6ic7tg3/kubudodidikivoro.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16098af7968ecf---86337519381.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/40895683590.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/207d4ad043739a56bc900977d851feec/68776336165.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/pekejupesu.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF9 10424 bytes
SHA-256: d122a009ed2f5f4c5661e0dedea0dce3e23bf62147e2f97215de82303e853302
font_01_sfnt_off000102b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC9 23316 bytes
SHA-256: 53d0a13d43bad7b480e635d05af98acbdf0d61e522f0f0eee45306cbc36a3556

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