Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5fdd824cc0f788e…

MALICIOUS

PDF

87.5 KB Created: 2021-09-19 04:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 416945fc6dccb00a7219312443610eb9 SHA-1: 9a384b73f842c130c44dbcd9fa2048314dbb56d8 SHA-256: a5fdd824cc0f788e0b8dfca69ef871d37c42e28bcf491dbcc5908650503d7000
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373cdf2cc4c---46543246413.pdf
    • http://cissi.it/userfiles/files/76540015036.pdf
    • http://vigen12.com/userfiles/file/656970650.pdf
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/ropifulenoj.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613be170b225c---guregebik.pdf
    • http://rotarybrescello.it/userfiles/files/ropararejulipakaselade.pdf
    • http://wsospice.org/uploads/userfiles/file/file/97353147145.pdf
    • http://gzsjlt.cn/userfiles/file/rumapajulufasovuzorovorim.pdf
    • http://chunmianxian.com/upfolder/e/files/20210916025550.pdf
    • http://epmachine.ru/d/files/12559094805.pdf
    • https://lengthening-sldf.com/userfiles/file/rasokokeforanuni.pdf
    • http://blesk-stroy.ru/userfiles/files/47247429697.pdf
    • https://ndmoyun.com/calisma2/files/uploads/96982391742.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/3491701905.pdf
    • https://inprovitparaguay.com/ckfinder/userfiles/files/34993636837.pdf
    • https://iqmuseum.mn/uploads/files/bulojojedadozulopuvena.pdf
    • https://jackinthegymtpe.com/uploads/files/202109061043441425.pdf
    • https://birutelorasin.com/contents/files/kulaporudutafirifaf.pdf
    • http://reliancefla.com/admin/images/file/95858801890.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/527b5c178b807b21ff2f1f5de51f0c88/raberogejoloxenumupo.pdf
    • http://innotack.com/userfiles/file/86428997842.pdf
    • https://cebrium.ssnn.ro/images/50567022995.pdf
    • http://www.perchegouet.com/ckfinder/userfiles/files/2102233758.pdf
    • http://acunambalaj.com/adenoto/upload/files/nofidejejelogenavit.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=iphone+xr+vs+s9+plus
    • 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_off0000f0d5.bin
a09b855a864f8c604defeef6424cf31a04e2a3d653af97cd053b51a787e9bcd2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D5 10384 bytes
font_01_sfnt_off00010856.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10856 16792 bytes
font_02_sfnt_off00012068.bin
688f9d5aac8c17ab16aeb1714cc8cce8e5837cb28d4148613c50b06ec1377bfd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12068 18680 bytes