Malicious PDF — malware analysis report

Static analysis result for SHA-256 164cf2039656a82d…

MALICIOUS

PDF

87.3 KB Created: 2021-08-14 07:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 151cd1526a1f0009811d41e4c6d9a44c SHA-1: 38bd46c0357a58c35d928d9e0482b059fb0c9a4d SHA-256: 164cf2039656a82d218efb76e77c9e6036ef3d0e182f502bb47b2d71184ac295
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to redirect users to phishing sites or download further malware. The presence of multiple links on compromised or low-reputation domains supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6169

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://jarosi.hu/files/file/dapekufok.pdf In PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee721547c89---lajod.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16086c555557dc---xetegitenukenixukozufox.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/dopeboporuzoludoz.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210731133616.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/faletofuza.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/lurinekapatojogamufaxanul.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/kerobojoxirowafivogo.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/e4bd8337ba9c01ea5ba8105d7655d73b/sokexupexugirojuxavu.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/b1858f2598aa227ec21f9788af2f2e88/26522334777.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/ludutunedibitolabi.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/4917372a81722e17f4290994fe99310b/kigiwepepopikiwe.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6891740ef2---mazamorobagigirapajozora.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/52961982945.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da2462ff39---8051459592.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160eca41aabcda---vobibewipusilurum.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8be229d8ae---lodat.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/55400841492.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/79336299335.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c174ac47b78---71097626995.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/3ee2928d65f6f2d21f3461f7816959a5/zapaf.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/2c2b900c64ad10dc37ee9a2647b6c6ac/menari.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/lijopuzugisepateda.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/8f9986e64331eb524407f5dbc2c24d59/nefigaguv.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e986bf2f3---28335166265.pdfIn PDF document text
    • https://olterus.org/contents//files/44863226565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=what+should+be+the+beta+hcg+level+for+twinsPDF link annotation
    • 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_off0000fa00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11212 17824 bytes
SHA-256: 86dcd35142767898990c6b8b262e8149cd426cc98ed33447079d8ad399b78eee
font_02_sfnt_off000140ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140ED 11140 bytes
SHA-256: 97e2f63cd006ee0b382fa62ab57c80a61abd0d6f001ca5fd539a33954bbd8ea5

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