Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f94e4144eac837…

MALICIOUS

PDF

111.0 KB Created: 2021-09-08 18:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6e7ab9037c45b37007a9769bc287d942 SHA-1: 5a3b21d8319499abc19cf836131cf6156e29c785 SHA-256: b8f94e4144eac837870f33db291948b3df0293fb870598d64bc77d9257b15566
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as 'Pdf.Phishing.Trojan-d2568dad23a94d95'. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to external, potentially malicious content, consistent with phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2631

Heuristics 5

  • 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
  • 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://www.geya99.com/ckfinder/userfiles/files/14545615016.pdf In PDF document text
    • https://jss-moms.si/upload/File/28317739839.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/puwupetusa.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347100811f4---temobelelakidebizegaja.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/vamelo.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16308892679246.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe4d8be091---fixajabaxurusuvijejoxagob.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210905214602_j0afcs.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/29197249323.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/53130926975.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/98147588806.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/lofota.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/xiwowu.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b1ab26933---42565187082.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/40168151274.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/2131049783.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131e27564c90---48679430325.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109042344243269.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/99961077784.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/30195236700.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/datimokofulelisagebu.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/busibunewebepumes.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/julitororos.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/jowaxav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=yamaha+mio+soul+i+125+manualPDF 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_off00017295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17295 10432 bytes
SHA-256: 021fb6e03a890f9d64ad4ac8626803157f4f34ddecf0ad6770cd87668dc7880e
font_01_sfnt_off00018a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A14 16480 bytes
SHA-256: e16fa176631f516262d4f7992fabfa361449274703f792e6a26ce8d9704c797e
font_02_sfnt_off0001a10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A10E 1868 bytes
SHA-256: b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8

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