Malicious PDF — malware analysis report

Static analysis result for SHA-256 5292fd2318526b8d…

MALICIOUS

PDF

95.5 KB Created: 2021-06-30 07:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3e7ed9bbbe86a6235c0dd11f9ff44c5b SHA-1: d9961c12b5a3fc7a608a4187e1d798a4302aa775 SHA-256: 5292fd2318526b8d13c1931ffb6bfd0f631b7cd5754c324822711995e82be4aa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress sites, indicating an attempt to host and distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of numerous links to external resources, many hosted on potentially compromised CMS platforms, supports the attack pattern of luring users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077fb9ce6089---mixozajobidekogogugazutuk.pdf In PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/nulum.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a70e7a57eaf---disewuzawesewepeganodaju.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b785a86a42c---6727497127.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/6707962604.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/selogabuf.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/17802813692.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/miae5v3o33muoccv6p4t5qqg27/waxabakewojovejali.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/iljrq4mqtvn657ktjvpcutd2e5/pobexutatibasopedaj.pdfIn PDF document text
    • http://aroma--style.net/files/files/pizovujowapat.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/c53952c1c52e7300c5dc56bb057964af/97507022694.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/jokiwepebi.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bda53e254c7---lijamotuzujovalusekikole.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/358aea5e419ab288ba404ed182f81a93/lagetunusazexu.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/faporodetejonu.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/4923209527.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/19252198de3fc96e294d8865b5fb8e74/47857919273.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/64l8u0sp7222lam26npmsuoec5/55496699265.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/7ef5ba20f80c50edf695e30b99889be8/4044663594.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/d92ebd3998bb2868302e1ba0001d1261/gowexizawidufu.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/raripebikitiwuz.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7c2fb737f---39021019892.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1a709dcc1---35643163208.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/8357955599.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/38609237552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=aptitude+interview+questions+for+freshers+with+answersPDF 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_off00011035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11035 17792 bytes
SHA-256: fbb89f52d6edc2c829b8eb6c33ade0404da17b311566d31f4313a03617cfb24b
font_01_sfnt_off00013ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE1 10928 bytes
SHA-256: 2d30839aaaba8125cf3ce6158d818876da57455caad40951684459f15f024b28
font_02_sfnt_off0001580c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1580C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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