Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae3bd83ef2e2a8f4…

MALICIOUS

PDF

84.6 KB Created: 2021-09-11 00:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f367329ffecc44673ebd805e644952af SHA-1: 28ca8bbb47f00c9bd8efd5441a22d4d3572837d9 SHA-256: ae3bd83ef2e2a8f4d9797a6a748954e0dffcdb0f128eadb346c239b16e5f0005
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress installations. The primary goal appears to be directing users to potentially malicious content or phishing pages through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8637

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 https://inprovitcentroamerica.com/ckfinder/userfiles/files/90162663051.pdf In PDF document text
    • http://kukdae.com/files/fckeditor/file/49700703272.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/93352775800.pdfIn PDF document text
    • https://masihpt1.com/contents/files/jifavi.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/wikoridosotetokolimobe.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f02600bd4d---gikodipawip.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/boxopalevi.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131902611095---sedaliwaxoxinas.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/59810285073.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/zeviz.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/30168962482.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210911_75B9B4F7E77441FD.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/pagopavopojavapiga.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/96398750955.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/87255123497.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/72167130368.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/sizosiwezap.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/majikenebijoribudetojit.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/59744830839.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/lagavu.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/d77c6sgb5t0hnrla2t2tfpf1bj/risepasebuvajokisa.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/weburatemabedipozu.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/39247217534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=app+scrittura+a+mano+androidPDF 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_off0000f3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B6 10576 bytes
SHA-256: 406137bac93a0178e87a092a6d2c79bd3bc11b4ac8fa604c3c8776fd4735ea9c
font_01_sfnt_off00010bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F1 17940 bytes
SHA-256: b9291522d0eb602e983fb651928302fe145dfd880ca74a57926063b38f5d36c0

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