Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b90607142a4694e…

MALICIOUS

PDF

78.1 KB Created: 2021-08-27 13:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 08c034b18b1f005fe4e764613f19665b SHA-1: 2a77905817d1defbc70d7fe82330764cba453c20 SHA-256: 7b90607142a4694e2c40a558a0cc8d84c766797babb63abaa7b51138b64e5d6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://krisoc.ru/uplcv?utm_term=helvetica+neue+condensed+free+download PDF link annotation
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16075749346100---81031810567.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/lazuvula.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ps4vb0545j1qrgu1i6lrkcdoa2/68279574144.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078b5ab27f23---59197751142.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/xepewewuferilejadanewuja.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607eda8707c12---toterosixiredulowide.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/81600439934.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/ropatuxifizem.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/03e301a135383defccc1d8b89fa3e597/35966260424.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3c4230909---natef.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088bc3893e83---56463526022.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160edb4a674741---bopokajaselegabole.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/3345fc8b5cc74081758c478eeb12dd68/wurobalapivonerusasemi.pdfIn PDF document text
    • https://anaksemut.com/contents//files/jafisuvu.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/jeveje.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/64285066939.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/2fbbe48c54dee304a06460999ac8484d/7482524200.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/r7gckr4ulio5ds72c3f2r4curf/87425533628.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210608234306606.pdfIn PDF document text
    • https://agermag.ro/mm/file/kerupolejo.pdfIn PDF document text
    • http://cjatkinson.com/userimages/52631262365.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fdf13f2bc---toxag.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/kidemalimibivumipu.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/54422515349.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a178b0b5fe2---lotarijuxuj.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_off0000ccdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDB 17308 bytes
SHA-256: e0b01dbe3679e495b20d822b6e5e1c944e4fbf69dd2b560d9455ce6f8d0f3f93
font_01_sfnt_off0000f985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF985 10712 bytes
SHA-256: 7470aa886ae7e382596fa71563fe6aba0f6439004caa752aabdd175cd574da5f
font_02_sfnt_off0001124a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.