Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c01b7cb0bc796c6…

MALICIOUS

PDF

82.0 KB Created: 2021-08-24 15:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b38b303939d17d6cd12493695158a30 SHA-1: 18af3fcf7ddd27cf47d80119f3ffe5469aa7558a SHA-256: 3c01b7cb0bc796c6814d77ca69cc955d68006ac97f4bc0a376f808e3c5f827eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the nature of PDF-based malicious content often involves embedded JavaScript for redirection or exploitation, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://rajskiewakacje.pl/userfiles/file/73592788213.pdf In PDF document text
    • http://aitrans.cn/UploadFile/file/F1202107250910058696.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/tofezuda.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/d23fb971c0505c25493932803c6c5923/famogepuzibonikaj.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/8fcaa2d64691abef937998c4fb9b8e63/nejuruvo.pdfIn PDF document text
    • http://premium-t.info/files/files/paxexarudetiwok.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/poxesidaragi.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/tavisevonobunozupo.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/zorud.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/66393658446.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f39e176e08---86367673357.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/talidar.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210511034621.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/sh0cn8pb0jf27f26d515f509gq/91895298567.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/14547181931.pdfIn PDF document text
    • https://actor-conseil.com/files/file/mobubudodaf.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/fuwopogubipoxagole.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9abaf0525---zakudepujap.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/bofakimidi.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160837e7fac391---xotupujiledu.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085748281919---niwelupiduxuzazikevaxa.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/6ugf2c66dngrsmplvn76686itl/bunovikenebub.pdfIn PDF document text
    • http://trekkingsapatours.com/upload/files/40183146953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=riddles+to+confuse+your+friendsPDF link annotation
    • 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_off0000dd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1E 17308 bytes
SHA-256: 252db6e55946dc2759c0231c6f205f76b01c8d33fe2e41422e50260cf162cc8e
font_01_sfnt_off00010a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A45 10568 bytes
SHA-256: 9958afb0031edc3bb871aa393865213659dc797a4b5ab46135fb3b0ddcb02774
font_02_sfnt_off00012287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12287 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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