Malicious PDF — malware analysis report

Static analysis result for SHA-256 c829125fc788d43b…

MALICIOUS

PDF

79.6 KB Created: 2021-08-18 20:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 75bce1bfc400279116798598c360a67c SHA-1: 0ddf1cbcfbf71543fbb7e227efc607807f1a0d16 SHA-256: c829125fc788d43b3a35b3b40ec64b7bf19eb964a2d6c3f7075b7f66027147be
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://allytemp.ru/uplcv?utm_term=i%27d+rather+be+me+with+you+steven+universe+sheet+music PDF link annotation
    • http://519pf.com/userfiles/files/58841785771.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/55303488763.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611403aea9bee---11254334178.pdfIn PDF document text
    • http://indecomavo.pl/inc/44125986044.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfdd124d77---munamamekubowulej.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/mejanexevowinavasuvesawaf.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/77966600333.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46f98079a9---59420037873.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/48566021718.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/pobudab.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081645dd0dae---60330644047.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/18443835452.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/18d46b31f893cec15fec3d4e82985d93/33402706930.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/80436851542.pdfIn PDF document text
    • https://aneri12.eu/res/file/jegetomewuzedew.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b810e2f1ca4---teparija.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b547af1a5ce---44959140341.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/f029d19af3fa763cae964b4fc6b77927/97042406851.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098ee9873747---guzeje.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dcb8315eb---bavetotozukarexeja.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/rawafiwufifin.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/820faa9ec86ce91f66ebc7adeef19a26/vibojatal.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/kirokel.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/6c7b119d29690d52c026baecccfd8703/xawefadokemovelekar.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/2f261070cb85b837a6feb541810b5b43/vakafafigiruteje.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/genenikivuliwami.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be48eb752bd---82732827855.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ced2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED2 18064 bytes
SHA-256: 68c3bf484fa6a1b7fbf893eee2cea1144c3cd428f8ae70f8cdd6aa1500d1b3ac
font_01_sfnt_off0000feeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEB 11080 bytes
SHA-256: 361a06381cc8c773f31b31f6b874c20464c2668c62aa0101ab27f55497863226
font_02_sfnt_off000118ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1