Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b504352b73b2f7e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-07 06:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 69dedccc7ccae00bc0e34c84472d8a70 SHA-1: 6a569dc962c95b8842b6a3f3f1860061d3764840 SHA-256: 3b504352b73b2f7e5dcd2fb42bc3b36339293d38ec7bbbc4e6c06fb65d400907
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely for phishing or malware distribution. The embedded URLs, such as 'https://laborke.ru/uplcv?utm_term=software+requirement+specification+for+inventory+management+system+pdf', are designed to lure victims under the guise of legitimate document downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=software+requirement+specification+for+inventory+management+system+pdf PDF link annotation
    • http://kubak-ubezpieczenia.pl/userfiles/file/49401616388.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/15667882838.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0239b06ef---kedufozuz.pdfIn PDF document text
    • http://pronobile.de/catalog/file/31171293422.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/96153152279.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/lejaloxip.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/14400462605.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/j32eetne51vselgthhok1dr0gk/32122897063.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/7a5d35a49d57e41fb19d579d4c615a5c/matipuwitepebazuzosomuk.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/ab52a9eca608d2236c2a5be77a135631/27461538833.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/vuvolidororenu.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/zikavofo.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/71485df2b5694aacd2ebba91c6aee0cd/vapotixefifan.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-28/20210728082546664053.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2650e2e1a---7994427750.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a299db2dda3---vulafalu.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/0d23e60aba5e6d692e17ee95cbd87b1b/82447100611.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161239a25e9f29---82089084490.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/94407743489.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/demubase.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/34063669445.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612193ae8f17e---63645758291.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/bbffa5dde713dadcee3e6d4e6d81bf07/xerig.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000d686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD686 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE98 17108 bytes
SHA-256: 69144591551be6719a4f75bf16af3f1f72013412cfa65529d4e91fde8a7e691c
font_02_sfnt_off00011afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFA 11504 bytes
SHA-256: 43bd34e89c1c66a65ba24360f8f3be7b602888689911215cbe0ef5100964d03b

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