Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e77a4f52efe87ef…

MALICIOUS

PDF

82.4 KB Created: 2021-08-18 12:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 691a6b3bbc7de83a4587b37120054581 SHA-1: ae613e54bee4afb878e220bdd481728ccda04a08 SHA-256: 8e77a4f52efe87ef09b4d8eee043ec386d8e283857e0397f2b65638c493b6c9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some of which are hosted on potentially compromised CMS uploads. The embedded URLs and the nature of the link farm suggest an attempt to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6200

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://polenes.cl/userfiles/file/3265995516.pdf In PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/94262303761.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/161087f1866889---wugulefevebiw.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5577b8f6ab---22829288548.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3d25bfb4e759172387656a8ed978cccc/51834445061.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/38470161091.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608db7074f079---36865681624.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/fonew.pdfIn PDF document text
    • https://designclarf.it/file/42639219127.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89979622935.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210603_DEF3674AC2956AD6.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/575b2b0be70297d1acec484aad19b630/tazaxinoxa.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608119b7337d3---nowidotubisa.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/11173380322.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/18985233957.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/1jgo5o32fgdnqdc51htqi691u1/zilejesaresepoxi.pdfIn PDF document text
    • http://pi-consulting.ch/download/41755391343.pdfIn PDF document text
    • https://superchills.com/userfiles/file/80448403243.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/1ed20qhj938j4u9k6q5q2hfk5e/turironewala.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8c91a5a6f---59562690646.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd3dd6907fb---45439410641.pdfIn PDF document text
    • https://birudongker.com/contents//files/86391736215.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610a050461012---sabudoxipilikuxegawitilaj.pdfIn PDF document text
    • https://primer-spb.ru/files/files/63731646046.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/lujewosikogosakufigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=assassin%27s+creed+identity+mod+apk+data+revdlPDF 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_off0000ea57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA57 17332 bytes
SHA-256: 2cb33d0dc1c0f8dca3ffc6083d29d044b61cc269f692d76e5f7aedde6f41c175
font_01_sfnt_off00011806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11806 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001301d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301D 10964 bytes
SHA-256: 8f2b94da99847fea7ab7e253e115b91c6e9aa2597947f96ed4eee5d28f604d6d

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