Malicious PDF — malware analysis report

Static analysis result for SHA-256 401e7eb9817c976f…

MALICIOUS

PDF

90.6 KB Created: 2021-09-13 14:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3685719ead9b9929a9fa2cea59ef2283 SHA-1: 2074215a4f04150ffedf8c10ae3a15f0b671dca5 SHA-256: 401e7eb9817c976fd4fd63dc978ad3fb0377e4d15a040e6ff332858f8ac70e34
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The presence of multiple links and the use of 'utm_term' parameters suggest an attempt to lure users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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
  • 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 http://tiquital.com/documentos/file/rojatojit.pdf In PDF document text
    • http://mentaplywood.com/images_upload/files/87775874500.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/81883022343.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/06a748bdef5e4d7ad40dd779b2f672a9/52994576468.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/bifagodibufojogidu.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/60061665734.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/16471980229.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/74865075956.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7e2aaf38e---midominezobuv.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-12/20210912111311266918.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/neviranideroxewupujulos.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/fuliniwamozofeludika.pdfIn PDF document text
    • http://hjhchem.com/upload/files/muzakuxozuzubi.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136bd3646017---70003952272.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/tibanefunosenozeni.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/97190956831.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/wurikapenitunujifoxe.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/xazobex.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/nofoturagabewudiluziseni.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/76054691838.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210906025739501.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/gejifiti.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/zagakinibivofulifanile.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/c37115fc41a6b0a609eca4d2c0730e8e/wamomawojawip.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/nofibijetolekopin.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/zoxabir.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/lebabarexinukunisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ejercicios+de+autocad+pdfPDF link annotation
    • 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_off0000fa3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3B 10676 bytes
SHA-256: 37fe758adc68fa191e31da10e72011a2b63a85109f57b4810f913e32c7ecbef0
font_01_sfnt_off000112cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CF 19316 bytes
SHA-256: 7cd2980b65d786eb7f978f546d3f3c28b010283e68858dd80c0726b79f0ace4d
font_02_sfnt_off00014430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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