Malicious PDF — malware analysis report

Static analysis result for SHA-256 905ff555e50dcdcf…

MALICIOUS

PDF

85.1 KB Created: 2021-07-02 05:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2fd21225e6d24b271e6e227fed23aa04 SHA-1: 4ca28661e3c93453d07e924c4fb9d9bc08333197 SHA-256: 905ff555e50dcdcf41ffa6156d293a821e79d966607e3c65cae2197f0911441c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting. The primary purpose appears to be redirecting users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://allytemp.ru/uplcv?utm_term=3ds+max+face+modeling+tutorial+pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ebd6fe668oa0eujdj5ib8mcm5/mumojomowowidowaw.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922cc86b599---59412814053.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160965a124d5d4---gokakinido.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e7821c9b4---30897006674.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1389cda583---16802563504.pdf
    • http://baohanhranghm.com/upload/img/files/98938862333.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/c64d4845a4443e5aff1c76b1e8e65473/mukosuto.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c01ef3e3bad---zaseloxik.pdf
    • https://fcr-fomentoconsumoerenda.com/uploads/files/kulipavubefox.pdf
    • http://954move.com/clients/4890/File/filavebalenuwukebebub.pdf
    • http://www.pranabkumar.com/fckimages/file/25536951368.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/9461de7a817e7b6ee0daacf33b8a9238/85512602874.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080317ab45ec---55515209454.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/gqdsqiv4c2en6otdfbt2p599ua/7417888718.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d52463932---39077676665.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5d3148fc8---xatamorudozuwemaguki.pdf
    • http://savitapiti.org/ckfinder/userfiles/files/sakuravo.pdf
    • https://martensmgt.com/business_school/uploads/file/tafoletidud.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa31b9936e3---mukodapudewidalu.pdf
    • http://consol.hu/images/uploadedimages/file/20825772366.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea74f5e940---9521622159.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5b2bcc943---fadebuzoriv.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9013c922c---41776101490.pdf
    • http://www.tobywells.org/media/fckdir/file/37022741776.pdf
    • http://phukhoabacninh.com/images/files/gozapimevar.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c721.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC721 16792 bytes
font_01_sfnt_off0000df38.bin
1a276b020768ee4dbd2e49f8a2430c60fcfe38b312bde6bd61f077a0f51f7128		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF38 11240 bytes
font_02_sfnt_off0000f959.bin
c56e5c6e7bf4826f9d864def1f0a690abfc417293623e4e5787673aebdec34b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF959 17552 bytes
font_03_sfnt_off000125ec.bin
0d91b93c30cdb4b9fcc5287ef31e0f6d3b75050094e35c3303e90e7f2c1d387e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125EC 2296 bytes
font_04_sfnt_off00012fe6.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE6 16312 bytes

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