Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcfb53761d39264c…

MALICIOUS

PDF

91.9 KB Created: 2021-09-21 02:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 492faa07665a72944e2dca62014e6c30 SHA-1: a51a93e31642e7dae34a0a00084aa903ce3d5bd3 SHA-256: fcfb53761d39264c8be95d3e37ca0fb2789469fb07963a8deed33213779ac350
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. Heuristics indicate this PDF is a link farm designed to direct users to external content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://queure.ru/uplcv?utm_term=view+47+online+movies
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bc6c44535---36465424506.pdf
    • https://nk-sostanj.si/files/file/morironenaz.pdf
    • http://chanakyaaerospacedefence.com/userfiles/file/gixexupibojexumogugonasiw.pdf
    • https://zibarajabi.com/cache/fck_files/file/xagakivamow.pdf
    • http://www.schule.havonix.com/ckfinder/userfiles/files/66131464568.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149063714acb---wedoxa.pdf
    • http://unicorn-furnitures.com/d/files/morikenomifemufije.pdf
    • http://stelmart.ru/userfiles/file/rorupujedu.pdf
    • http://cokhiminhhien.com/media/ftp/file/pawebovonoferuperajogoto.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/5d421509325673cc4db94eee5df17795/67156243592.pdf
    • http://schokozentrale.de/idata/kubevoxagexozew.pdf
    • http://progetec.org/userfiles/files/nixinirokaridamexokama.pdf
    • http://inoxbienhoa.com/upload/files/papubefo.pdf
    • https://willes-gb.com/uploads/files/202109090250021221.pdf
    • http://nhactheducthammy.com/upload/files/munekopimetifa.pdf
    • https://semineebrasov.ro/printuri-fi/files/39582264622.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16145e021de1a3---sanojapori.pdf
    • http://spostojow.pl/userfiles/file/55812788161.pdf
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/febisakogenosesadopo.pdf
    • https://hnhaa.com/userfiles/tnejp/files/konerurefevavamur.pdf
    • http://fc-junajted.com/upload/datoteke/wovojikule.pdf
    • https://doan295doson.vn/namthuan/images/news/files/94350736678.pdf
    • https://agape4u.org/userfiles/file/16687897320.pdf
    • http://galantemontagnana.it/ckfinder/userfiles/files/lidevegekiritogoluwu.pdf
    • https://stpatswatertown.org/ckfinder/userfiles/files/kawapufunaloz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010648.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10648 16792 bytes
font_01_sfnt_off00011e5a.bin
4e6ecbe85584c859088a17af0dbe1657d4717df775a92ff022ea5f99052af11a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5A 17228 bytes
font_02_sfnt_off00014b16.bin
930634524b80ebcb11bc8090ba98daf1afded6269c3b165805783b4f2a051247
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B16 10160 bytes