Malicious PDF — malware analysis report

Static analysis result for SHA-256 7926400fc83e8a57…

MALICIOUS

PDF

96.8 KB Created: 2021-09-07 14:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3a94015a36b354bf42add43bf6f53097 SHA-1: b71f33d7f4487726c570761a4e8cb7935e954a6b SHA-256: 7926400fc83e8a573d3e7e5744672069561006d2c97ec4fb1a31e013347a23d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to manipulate search engine results or distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9811

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tsutae-f.com/js/upload/files/mutinubakifofu.pdf In PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/m277hqqkp67nqu1qfg9gdgb8hu/pidamivezipepulek.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f825e6357fc---nipelorokori.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c928b1569dd---76313679988.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/69318398655.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725d422892e---zafikatarizifalavefuxolal.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/52501110694.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/8096f28995c18a8a4009a5ed12b24f46/85260521667.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/sufemuxo.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/75534939407.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/f4ejjtjb5cfquh3k66b9ldtpm1/58573947526.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/dejedaxiniwuki.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/21947018949.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fb8d42c248f---73468350036.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfe65ee9fb---zujetufefanupupamisel.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210820120959.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/313d9b4180f23a8cab03fcbac4254c85/bomigopimevilatur.pdfIn PDF document text
    • http://rem-proekt.com/f/file/79105390627.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896e497c254---93501435610.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/a91335ee854c9d7c92294914dff7da78/3114591468.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f98193b85---bexorizijamijoxixekulux.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcaa20648c---18553461381.pdfIn PDF document text
    • https://orangerun.re/photo/files/lavuzodovojesi.pdfIn PDF document text
    • https://avenue102.com/uploads/file/756534564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=lensa+cembung+dan+cekung+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAB 16568 bytes
SHA-256: 4ed47fca4feee7cf6d1d740501711e74290ac7573903465bfc99d115b791e56c
font_02_sfnt_off000122f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F4 10796 bytes
SHA-256: 002174c2d19dd55c502997631dfc6fe202a17f1fd950880c767dcb1385245e08
font_03_sfnt_off00013b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B60 1920 bytes
SHA-256: 10399ae3cc0cf40733ff9521ee43098bbad0bc96a2fc96fff5707ee66ff88e4f
font_04_sfnt_off00014452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14452 18620 bytes
SHA-256: a38b7884a293ade111ed371737bb65c46c90f0c7f7bf96bf812f02e45903344d

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