Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5dd655c588d0cc…

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 00:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: be25ccba641a3734ce6a7728750abcde SHA-1: f54809a4091d3ab149435d967bcd546330a5c378 SHA-256: 0c5dd655c588d0cc7f87d37880501469e1dc1189967512fb7998fc05b733b109
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

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://philabc.ru/uplcv?utm_term=ppsspp+games+compressed+file+download PDF link annotation
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/7pdafruoes01dgk7q01g6fmafb/sazotedu.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/lusefovitidovuxa.pdfIn PDF document text
    • http://elsped.hu/files/file/8508218389.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/rubut.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/tosuwerivofumumosokez.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/demenavoborozizirarexala.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/703ab4b7621583cc600f0642cf4f5633/8261322285.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/xuzinaxuwewubuduleki.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/sulapomofugojomixezixeb.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/25440049289.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/14513268565.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/19248809824.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/zujuzoze.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/12290408957.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/2ba71f1a733ab0be83a8ab219ac87f8f/95987682227.pdfIn PDF document text
    • https://htchninc.com/d/files/vifeginomiwarineduxemika.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc1f577427---29497982859.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/zifujagifawon.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/bipetumofazujirax.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/21306427933.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/wiwenowozikoroguj.pdfIn PDF document text
    • http://oris-am.com/editor_up/devuxusolubisur.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/mifuzukorokidosekotejipi.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/taxovidesolaxorojenorif.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_off0000d8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B1 16772 bytes
SHA-256: 408af9cc5ea4ab271edd42e8d3ea96a6ef3daa88e20a57a233d3757f8f356f3f
font_01_sfnt_off0001044e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044E 10952 bytes
SHA-256: 61acb649d914ee5fd7d39c01c8b7200406791577dcf9bb7efffa0daf5ae7b490
font_02_sfnt_off00011d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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