Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d3bb2c069a7e6b…

MALICIOUS

PDF

82.8 KB Created: 2021-09-24 04:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1ab9ea8840c09c9ff81d0f9602c650f5 SHA-1: 27adbed3a34274d32a7cbc5c780af51b5f3e05ce SHA-256: 67d3bb2c069a7e6bd07f027ed5d93fdf334b1af2bd629fdf28f6e300f0ec640d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised CMS upload locations, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links on disposable or compromised hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.physedu.in/newsite/userfiles/files/sipat.pdf In PDF document text
    • https://kisikana.hr/UserFiles/files/7522006038.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/82407501216.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/10335600900.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/6d4202a3429e9279f49891651de78867/41169626449.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/36901927547.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/13998358065.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/ropisojak.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/78982319365.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/34745361678.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613add091be7b---supidekajufexuxaxeler.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/16304574210.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/gomopenad.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/98501164472.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfd4d7f3c8---papelijabe.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/qld120hh7blc71hdkuffu0ae01/4975629952.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/tknucvr7tlt5ms7uk35rg2cfvb/vesejubutibujekofa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305ebcb299e---xamivafu.pdfIn PDF document text
    • http://evola.it/userfiles/files/95532255634.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/vaxewero.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/86333413439.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/8899919517.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/dupozo.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/dijopew.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/89083735843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=download+rom+pokemon+black+and+whitePDF 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_off0000da36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA36 10928 bytes
SHA-256: 17e2825a80ba7d96f89e8d95f4156462dfccc120c9a96f26c1baf5ea187d54e5
font_01_sfnt_off0000f317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF317 19368 bytes
SHA-256: f10f6e19875359379b8c5f81ee3ff8172af894ab3331f58f115e8a4af17f1f0a
font_02_sfnt_off0001259b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1