Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dcdb8c6655d199b…

MALICIOUS

PDF

94.6 KB Created: 2021-07-23 14:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6339c1de35202ae3d62936d7e8ef5cb9 SHA-1: e7a61203a53169c0f332123e1f30d1b65b77672d SHA-256: 5dcdb8c6655d199b68461bd7a69de4e1e3907c28c6e6017c7e6b1cff43c9fee5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on disposable domains, a common tactic for distributing malicious payloads. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides instructions to decrypt a password-protected archive, a method used to evade gateway security scanners. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://hotararicedo.ro/files/files/juzopononoxemabitunifiv.pdf In PDF document text
    • http://ilturismoinitalia.it/userfiles/files/debaregeligotiwobepatuj.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/48628042989.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f005670292---mekimakaketut.pdfIn PDF document text
    • http://amandamaitland.com/images/file/80751766780.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607815a2ecc34---romikuwalapizisubi.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/woripiwab.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/410b5d1af7f2254c0c4d36e142e96d65/18716711821.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/8164477627.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/9992237595.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/37d6cb65c225f9e2787cafb0ed269caa/lakol.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/re257out4vllnodl1ud78002l1/verosinekix.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/39044eb7780a931a61b1589afc2e4d90/wukaxov.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7c1423e4b---28240775450.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/n1gnhj8k5m9k6u1v3e77as171v/nuwosuvubutujenaba.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/rotir.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/snv8i62hupnmnagcrr79uei597/kasofune.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081acfa395b8---7718094443.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dae57b202---butegutajuxutuvaluboj.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/22u1aedccdd4jrqb50bto35361/45725909552.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/69795172232.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16073d295b7c72---4958821920.pdfIn PDF document text
    • https://umartravel.com/files/fidatometuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=juntar+varios+archivos+pdf+gratisPDF 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_off000110f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F9 18276 bytes
SHA-256: abd9e44e17e3ec7aa96fe0c74398bb48e65ea5f63e99977a3483c4759b450257
font_01_sfnt_off00014036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001584d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1584D 10880 bytes
SHA-256: b1d5f5224090f30d38f7c6e14ba8ddfe41b971765a5b862dac04744ecf76ff5d

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