Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4c6576c1c9692c…

MALICIOUS

PDF

75.1 KB Created: 2021-09-14 06:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 294cf190d387c6e3a84503ef82cdea4b SHA-1: 8af2cc2acbcfc88d3c17362af5e95d426c904047 SHA-256: fa4c6576c1c9692c08c26ccd723fce11974e568435bdb0c80badd94c46e214c5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised or disposable domains. The ClamAV heuristic identifies it as a phishing trojan. The PDF structure and link farm behavior suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3852

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://kalitelivideoizle.com/resimler/files/5437473160.pdf In PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/82847072798.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/pizudikajovezo.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/nepekevufavikilow.pdfIn PDF document text
    • https://mlspoland.co/files/file/refegovojikojumeritosurex.pdfIn PDF document text
    • http://cissi.it/userfiles/files/24684553038.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134fae5a9270---66843753849.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/72455003849.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/retinigeraxukizoruwijinew.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/mipifus.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210905155945.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/32697371972.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/57949902997.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/75189847419.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/savipixaputabaguweril.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9b6d2534---24759692927.pdfIn PDF document text
    • https://olterus.info/contents/files/digonuru.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/suguke.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210909201633.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/29912688035.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/refatopijikidivami.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/4fd351ac6c4a11fe920cc23aeaf2b81a/3025851860.pdfIn PDF document text
    • https://educhina.mn/editor/files/30414301899.pdfIn PDF document text
    • http://4yoga.by/pics/files/sesisudenelijepekezexifad.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/43970514586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=yotsuba+manga+japanese+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF765 18640 bytes
SHA-256: 65eebe857cba6ef401268853a1ce19cd4b06e0d1013d4bd8774bfd66e1a0b7a2