Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d5de770198c291…

MALICIOUS

PDF

78.1 KB Created: 2021-09-16 15:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1454d01bfcff4b5dafae94f43b67177e SHA-1: 737092e68f76b0f4d72aeb34470d1e13ad8d2dac SHA-256: b1d5de770198c291faca8fcc19fb0345b9b402a17daea39acb559f8bc6636cb3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, characteristic of a link farm designed to redirect users. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns suggest a malicious intent to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6941

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://technoarc.net/userfiles/file/1276995636.pdf In PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/52530541031.pdfIn PDF document text
    • https://ntc-container.com/upload/files/81736684928.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/80653095873.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abdf668aeb---pojufefidukizipogile.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/mafixebilofotevo.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/rodarimizogogonegenuvuw.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/e95339509b7b02a01ded2b11026ae849/wexoma.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/ravijatu.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/65347578592.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/32560592617.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/xenumowopizetozijajososa.pdfIn PDF document text
    • https://ags-car.com/upload/files/mejutenidami.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/perexeluzuzirafemutesutu.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/tupuvigomajelebamasepaxar.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/vanaguvebivejisugav.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b5213b7f8---gewojobifab.pdfIn PDF document text
    • http://fruitvita.com/files/files/54877916949.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/batawesigodevusa.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84926821161.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/totakujefereribizaboron.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210906212949_528380204.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/64424990109.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/37699596193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=element+td+iosPDF 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_off0000d724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD724 18084 bytes
SHA-256: 194067f5798f67092cf747539c1372e06bc7fead5230e49a24f57686e5f1e7e3
font_01_sfnt_off00010626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10626 10132 bytes
SHA-256: 1212aa33a1bb9288ef4772198ad0608f161e8412973b78e0747ba4f2dcfd3f4f
font_02_sfnt_off00011cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1