Malicious PDF — malware analysis report

Static analysis result for SHA-256 644959f112cb138d…

MALICIOUS

PDF

86.9 KB Created: 2021-08-04 10:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c1d8695f715bddea2811691dcdce1120 SHA-1: 3e5cbbc4214ce07f92238b30930d91532ee34046 SHA-256: 644959f112cb138d7ed5f3a43cc0a54af40437d4fedb79df7c3e6be649b7307c
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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
  • 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://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/72923044794.pdf In PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/luzimutazaselo.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/fazinokukesijefuweje.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/47484714615.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/534918261cc6eb0a6be728b79df06c75/35002754376.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5817b039bc---loves.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/jerubemirerusewomefezurax.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/35022896085.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104fe89b17ae---24222087955.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb15ecc7d6---fukuzofol.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/komoxawisefawufeb.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/21f97e6ae8d0d369ab1be1910c95c402/narefatumadalave.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/xedusogala.pdfIn PDF document text
    • http://arablift.net/userfiles/file/belexoxiwigola.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/64234899475.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc9541d79fe---durekadugimedogutawefebop.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/bukofoxanenadelamomobifov.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbcefd92d4---votenadobimof.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/97b725ffa84afd764b6b08ad600f77f4/1763994440.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6a375c74b6---tupekofefaguluwebis.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/27397521655.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/rokezulidugigilivuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=macario+cuento+completo+pdfPDF link annotation
    • 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_off0000eff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF0 17832 bytes
SHA-256: da0a5dbcd7ec500d1448c4cd48e5388e7d9ad7db60096127756ee7973087e6e2
font_01_sfnt_off00011c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13498 10704 bytes
SHA-256: 83de55d034d7c1467506111cc82a6c0af385d36062150b79d2b39959c4df9da2

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