Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cbdcfcce6e72144…

MALICIOUS

PDF

87.9 KB Created: 2021-07-26 10:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 88d50068c3c0d1b9410264d5e8a39cda SHA-1: 63d73668a5af3e331997bb3885de69bc1936687a SHA-256: 8cbdcfcce6e72144f50b9e15c142cfeddb3311ff6a2453ed3987eca012f61e53
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to compromised websites, suggesting it is part of a phishing campaign. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cfa67bc24---49456292566.pdf In PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f33d6e43968---sukasezozosuwobuxelito.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/pidisigixapopopabiwikose.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/73159828202.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/8393937736.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e79410d5af---nevizamisukajag.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df4055aa1f3---51388957731.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/14528204770.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b87fc91daa6---nulexasuvukakasamakov.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a82f6ca14a5---jozuzarexaj.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/c2f037cd92df92d1359cab27fc8afca8/jejagilenudi.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a679cee12---jikeduvoboxatedejevisedu.pdfIn PDF document text
    • http://flomojapan.com/upload/files/bonos.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/9960188183.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/gininodulememes.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/21585989425.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/telonetijiwonodadu.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/2aac84ee7438008154f0f0edbb162422/pafokebemasuwu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efed30c943---lizanenopotiwoxo.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/38844609122.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/32376465194.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/86377787132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=descargar+dbz+budokai+tenkaichi+3+ps2+iso+espa%C3%B1olPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4F 2116 bytes
SHA-256: e42dbbf68b892c64a81860324a8126c8eb2a2f54399641409d771bff80c64d3f
font_01_sfnt_off0000e3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F8 11684 bytes
SHA-256: 0fb8ed8a24c766069263014ac28663c586bbe335aadaa5bd0a05c5e7d21c95eb
font_02_sfnt_off0000ff33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF33 21700 bytes
SHA-256: 0f9a4ea769fa8cf54b954b4a5bed258b9a5d633fb2111b8a857368afb9b7060c
font_03_sfnt_off00013653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13653 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1