Malicious PDF — malware analysis report

Static analysis result for SHA-256 3308a0d7b56d07d7…

MALICIOUS

PDF

88.6 KB Created: 2021-07-14 04:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 12d5cb54d68dd01c2ee6ed469b6aec85 SHA-1: 1da925a59aee6fdbed602cd19bc960523a40b651 SHA-256: 3308a0d7b56d07d75e79dc71fee8b397e14e4fc96a9f3b8a6456ff58cc97273f
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The presence of these links suggests the document's primary purpose is to redirect users to malicious websites, likely for phishing or to download further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4731

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
  • 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://crewmak.ru/uplcv?utm_term=full+body+routine+for+mass PDF link annotation
    • http://sendedianqi.com/upload_fck/file/2021-7-5/20210705212510596042.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1737c5007---81169518057.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/kagutotuzedubiko.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/0553f78c00a5a344216b8c3db44e54e0/dofodadanajex.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f864e6532f2a3ffb7c01b176862b03bf/nuterojugotolul.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/sinugizabuwiwabukoxiwos.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/51991580770.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719a2b6c3c1---paleverodumitem.pdfIn PDF document text
    • http://godswaynehemiahmbc.com/clients/878002/File/tevijovorus.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/18177052004.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/c2d47847b856894e0120159ca46c34fd/11111320531.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bee9b15b3---paxedekibusulego.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/b58006b4aba31f4617106e4cc0b18ca3/11299619266.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/pifagirepa.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/72289855325.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/79afus0utg4fgci0jfsbub5kbh/98852643416.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/69163030241.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/296b46a63c1d66bef1363a4f2ec65d21/donobifi.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/qp4kip7psgh6j7eqe6cnl0d0pm/19911408330.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/nogulezutokududadebeluzag.pdfIn PDF document text
    • http://gute-reise.ru/i/files/files/fovelexigamosagi.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/0acd7c24015e5e8c5c0f59d5dcf79641/bozogopovuvefe.pdfIn PDF document text
    • 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_off000102bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BD 10848 bytes
SHA-256: fd184cded1b69c1e6cd126195c6230fdb9d46766d6f6bba4ce84c21269a063f5
font_01_sfnt_off00011bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D8 16456 bytes
SHA-256: 7f73eed66a37306bb3a1da8275109327c876eba18ab0d1d63dafca90f15fa92b

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