Malicious PDF — malware analysis report

Static analysis result for SHA-256 735c51946aae73c4…

MALICIOUS

PDF

105.0 KB Created: 2021-07-28 14:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cb23c7206747d4ccaee0a535112801f2 SHA-1: 34d1a38abdaa320cf02fe13e40b6b486527c07fb SHA-256: 735c51946aae73c498ceb97c31238f3ed03ca30c35d1032e45f8aaa4be5cc21f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://seksdagen.nl/userfiles/file/62676416112.pdf In PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092600140c88---madam.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/xilujubejalofirijurera.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/1faba0f2ae45730abc01bf4c8bf85d3c/83733979660.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/de082411f82ad9b5033462385f5672db/98132218060.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a95fd3996a---3710169667.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/nimibumemumunupanoge.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/92329924428.pdfIn PDF document text
    • http://efrex.cz/files/file/norofatalopara.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aacfa85c829---nefabaleke.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/43ph4h93o0ukj25gjrdffam7i6/lepikoganekarinozimiwux.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/fekugalenapuvivu.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094179076aa7---sowavije.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aebf4c048d2---bubobidevejevorajaroxupu.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08654bedf9---rutujonebefasisijiziged.pdfIn PDF document text
    • https://binhvi.com/upload/files/70823623132.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/oqnnbmglf4pdrtmth55n6eo791/varafavor.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/e4tfm9ib3lr17tciceg351mt81/10151797589.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/10c792d73b3c06f7d94b36a495799766/mitikawinewovipigas.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a77041815---xejujavuji.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/zamogobi.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/15171984159.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb1e2ccd14---sesotokorojorikuzabef.pdfIn PDF document text
    • https://testbanIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=numerical+analysis+10th+edition+solutions+pdf+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB1 16448 bytes
SHA-256: cbe26b1e584337c34dbd006577cc06d980cc400788cbc580de90d16463bf2b66
font_01_sfnt_off00013168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13168 18312 bytes
SHA-256: 211a185315bb0db169b4b3ad91039131dc468a74e55767186b231e3c84640bb1
font_02_sfnt_off000161ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A04 11336 bytes
SHA-256: 73b7761e8dbf08dd1a1e91efe96a4dfddc07d836989ba30825793eb5a8fdbd09

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