Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a4f51a40a7489e…

MALICIOUS

PDF

85.2 KB Created: 2021-07-31 08:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 67abd1ecb705190d7e1bdc27ef90731f SHA-1: 73c8cd38528ffb1196ec368a281dfa2d72b2e0e9 SHA-256: a2a4f51a40a7489e306c1a9a65c686ce0d82505b86d979851f636269c15064d0
204 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, employing a 'download button' heuristic and explicitly mentioning password protection for an archive. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest an attempt to distribute a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=download+pes+2013+bagas31+patch+2020 PDF link annotation
    • http://steakclubhn.com/campannas/file/4945221109.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/adf66f8fe3f0a488d6b36140ec8ec477/towilapazewejomofiri.pdfIn PDF document text
    • http://yoron.net/up/files/tixiriserar.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/2897a34c34ed7581498f9ce117273fca/69131473714.pdfIn PDF document text
    • http://gptools.net/userfiles/file/70920646568.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210706_021644.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160749b77c4355---zupoboroduxinimalevit.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/vuberewozusimetegu.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/l3euov6f2e45tknglqva4mfdqi/basunojowisuwosap.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/36b42c72f8e2de97f03f47231da4abac/duzivejorefalezolobuto.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/nukupejidizujosexin.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160766fb1e9292---gotomopekak.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/amst98e12dmdp6qknet2ja2ce2/lepugegibafo.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161004fe699e2d---pesezezorakorukukozuku.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210727_132805.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d19b186f402---44527507975.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/b2739c89088d62eff7c6bd73ddccacb6/wixuwage.pdfIn PDF document text
    • http://mousike.it/img_ins/files/zegufafaridizoweg.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/072b6a106035fd4fa705e5b9d73532ce/61848542518.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/76302764187.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/o3fjnlv582f8ch9h4plprms2ck/fixojotirunesizur.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/zevivelaxasune.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/17448684461.pdfIn PDF document text
    • http://myjacksonfamilyreunion.com/clients/e/e2/e2167ce47089e9b789d53270b7cccc99/File/samezefozimo.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160839480070c6---23615591695.pdfIn PDF document text
    • https://leavingcare3plus.ch/userfiles/files/pamifolapozol.pdfIn PDF document text
    • https://maintogelonline2.org/contents//files/57083364445.pdfIn PDF document text
    • 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_off0000e60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60A 17500 bytes
SHA-256: 7f6af9f32a5bfab538eca28f937f8c9c6dfa8f9541efd78929cb7ef6e61c7859
font_01_sfnt_off00011401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11401 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C18 11292 bytes
SHA-256: 463aaafcc404b57a803c7aa451e695328b3d135e93a81896ce0a08313494086b

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