Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc824ed2250ec30…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 03:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 172daad429b66df31eb16dfef1afac2e SHA-1: 1c56110abf957e9ebe95467e980c466540ca26fc SHA-256: dbc824ed2250ec3030c8495bc3659585ddd0af5b49f7fd97765a8e5f29802789
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cu-hinothai.com/ckfinder/userfiles/files/16642037132.pdf In PDF document text
    • https://psfund.org/public/uploads/files/cms_files/97892420746.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/nukixatutemamegikafavo.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/c72535b238b0568525cfcd86cc6e28cc/mijuranibiwivifap.pdfIn PDF document text
    • http://tfforming.ru/d/files/tavidiputivulupopup.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/9220459ac58f7977c22c2452711b9dd1/puzanopovejezesi.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/zibewi.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/gagibizid.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tupagi.pdfIn PDF document text
    • http://ume.civilkozpont.hu/uploads/file/wizegikiwosemevuwakijo.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fodojupetelilusurave.pdfIn PDF document text
    • https://masukpt2.com/contents/files/8448567381.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/1439119348.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161408dcf9a45d---79384825194.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/tawijen.pdfIn PDF document text
    • http://julianina.dk/upload/file/93924581234.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/74984706cf25bd84569aad9b197bd07a/1207517367.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/71309216560.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/wikugama.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/wekisopidevewuze.pdfIn PDF document text
    • http://fourfoods.com/images/files/bataxomajilarerabimamiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=samsung+keyboard+chinese+handwriting+inputPDF 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_off0000ac37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC449 15396 bytes
SHA-256: fbecaa817170ebba4d90fac17c1fb93f5f63c01b23a809e14b6fd10725d673aa
font_02_sfnt_off0000eb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 11524 bytes
SHA-256: e2b315dcabe64fa96cbc40722c5570ac5ef8ecd8c639cdf3ea6bf6d43c88eacb