Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1b36fb3069e5a7…

MALICIOUS

PDF

83.1 KB Created: 2021-09-14 18:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 82546d7913a947dd597762c0481264d7 SHA-1: 4d47f2769ede3613dae26c0e99637bba4808d699 SHA-256: 4c1b36fb3069e5a7c497bce8088dc68db0983b378593d03f3cf8b7886b9aad0a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised websites and utilizing SEO poisoning tactics to attract victims. The primary goal appears to be directing users to download further malicious PDF files from these compromised hosts. The embedded JavaScript likely facilitates the redirection or download process, contributing to the overall phishing and malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=html+and+css+design+and+build+websites+pdf+free+download PDF link annotation
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/c61ee6c55a6cf13dec8bd8bcd93a6bb0/jixelosexipikiban.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-12/20210912023018967586.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/46235684355.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/bedusikudiviv.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/betaxafifisigajisiduwij.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136797d7d9c0---togixebugawu.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/luwit.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/gixona.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/qjase8d34juclupq55vb2hjtl2/3189640182.pdfIn PDF document text
    • https://andana.us/files/files/bofipadonekojik.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/2340877722.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/98998716725.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/69829215468.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/kozapakutegibu.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/rolefabibapinelumonaxoj.pdfIn PDF document text
    • http://myesen.life/userfiles/file/sibuxubovubusikaxazilibos.pdfIn PDF document text
    • http://abnicum.ru/files/file/gezufodoj.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/dopivutegovuki.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/4vhhg0eg92qf4aktmb8k66k3u4/lukudesixon.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/bd99c49d1d8b4a14c32ae82ac73bbb8f/kasilijaremewi.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/5f996ad89014bb70a6e4be6976297f6b/rubaxililanajifizifetixej.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/baditugofudavuresipikiba.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210914011314797.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/kobekumumavabatuxo.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/kabugafabajap.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_off0000dd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD68 11280 bytes
SHA-256: f388f11a7c7afe2c2d5da84afe98adae471cbf41e7414015b845969285017c40
font_01_sfnt_off0000f772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 18112 bytes
SHA-256: 84af0721a7da45d54642f36144dee775851edb3fb23d2abd8b7bdb0441abdc41
font_02_sfnt_off000125dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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