Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd78a7bb9db24f85…

MALICIOUS

PDF

87.4 KB Created: 2021-08-08 16:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dbd0d062800134c3688d79816198e2dd SHA-1: a11f25cd1f093504d5f3cadeed846c0f2de52563 SHA-256: dd78a7bb9db24f85cbb4106ee0075bfec7ebbce821c571afba3e5f39008843e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external websites, many of which are hosted on potentially compromised or disposable domains. The presence of embedded URLs and the heuristic firing 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this document is part of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9208

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://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98001187270.pdf In PDF document text
    • http://goldartline.ua/userfiles/file/bizujavu.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/giguvobawukexefebimop.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/bezomezopozixodebilaga.pdfIn PDF document text
    • https://summit-christian-academy.com/scauserfiles/files/45081005930.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/11644683561.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088716f61838---timubutezan.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/72b8718e7958e5568abd72ccf2b899ec/serukexomuzamiwoteserutes.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/zomeludixipini.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84f6abad7f---rakakonoritebu.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/63813832170.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/29401903722.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b406fcc9a1---42928678879.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/620c7a8e54040cb1d18043bdcba45cb1/47034890464.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/24269645611.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37167a2899---36766094728.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/8811c44fedde60c5f7428f55b9274a37/riroz.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/duzuxemevuvonuda.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6566ab729---wagobokojexenilepaxozenox.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/rekekepitefeved.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/tilaxoset.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/buwejabokor.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833cd2104cd---zodagaketudowidavezekaras.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=que+nos+diferencia+de+los+animales+a+los+humanosPDF 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_off0000ff37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF37 10800 bytes
SHA-256: adbbeca4cbbfb223ce097777722814a5dc2d5b98d2ca57ee9ed65f3a98cb2b95
font_01_sfnt_off000117f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F5 17900 bytes
SHA-256: 2fc57968b2a081e0a7ddc545befbdcd7b35d0e751d37b73b1e8c3a3fc112c493
font_02_sfnt_off000144f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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