Malicious PDF — malware analysis report

Static analysis result for SHA-256 772a77e41bdb1d31…

MALICIOUS

PDF

57.1 KB Created: 2021-05-25 09:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0799d17e1cf3507c088371cf7c8f738e SHA-1: 49af166901070acee501829d4ccd5ce93a1bd0f6 SHA-256: 772a77e41bdb1d3141cabd48de624465bfccbb7b6f4c3031e573648998e8b581
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or facilitate phishing. The presence of these links and the overall structure strongly suggest an attempt to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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 http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/78180a628e9fdeeb62e9742bd3b78d76/78710306564.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/0b5c457bc5388658913c3d46f24dc4f5/35089365318.pdf
    • https://alatheir.com/atheirwsfiles/file/luxezaludanowinivasowimes.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c346ef775---38814845777.pdf
    • http://airconbank.com/upload/fckeditor/file/92825601538.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729bdda8c9b---5764978921.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/021d55655390e2c13da8e55efa1bee8f/76502648452.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b497839600---10970010855.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/80e59d9b75b42cff4d0c45f65677762b/30981763221.pdf
    • http://nuestratierrapremios.com/campannas/file/21806907482.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160777f165efae---pobelipofa.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919e80dcd1a---buvuretoxemabenimulonu.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/u1mqq15q8bnt7a5fd8t2eo3m08/xexureradane.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/32549a0a47e97ee8e4ddc68fd78cf25a/46504214713.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=antique+masonic+knights+templar+ceremonial+sword
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d652.bin
b255e407a57580087c89f39d33fc080b434b324c5f256966f93b6f7ba6ff9a0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD652 5640 bytes

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