Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c5ae356c82aece…

MALICIOUS

PDF

96.0 KB Created: 2021-06-29 07:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 04ba7eff72afa64b2ff75fc0da9bd197 SHA-1: 545c25f8543eeb305e9ac8474aaf1e97a0929ffa SHA-256: b1c5ae356c82aecee8d5fbed17e3937bc28677f6a345232227e031672efd8eff
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to various websites, many of which appear to be compromised CMS uploads. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to lure users to potentially malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf61d9d00a---16627237977.pdf In PDF document text
    • https://1877painters.com/FCKeditor/file/60299167974.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/bavegedaj.pdfIn PDF document text
    • http://capitalclassof1971.com/clients/4/4c/4c1e4f015ba9b8bec237dc1ca705466d/File/nisanumojovis.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf6bc84a0a---gejakaza.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/53976653534.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5da61815d---70868543535.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/gewuzazowumaxajudukisuxim.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a25c18afee4---35674024792.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/xesikimuzofuputifobo.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/gesitunageguwimeva.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6e5668951---jamomo.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/le61q95l8obm8f1mqshvtkgnjj/ratis.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082acca33dcc---63999124398.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2d694c2fa---viponepubawadafixatev.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ad839b143---50120386602.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/9b1147e6c2503c60a66d6310512c68e5/bofivozuxevafenuzidozuw.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5ad311966---62309495766.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090b56147c33---42484810352.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/bazuve.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/bc577f0e31f7a8df6199077d90a77c3e/wuratifapopetisexofe.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f9ca7c5c9---53197684362.pdfIn PDF document text
    • http://funperm.ru/content/file/regejetibaveve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=link+ship+chandlersPDF 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_off000115f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E07 10440 bytes
SHA-256: 944a33ddad7ced8dcf3a5b82e89076a652b8357e4d73b45f7204ce3a3e1052c5
font_02_sfnt_off0001458b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458B 17668 bytes
SHA-256: 2adf664d017637097fd179b17809a99bc671e189f8184501ec970de00ddf8597

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