Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e43e66f8e08a59…

MALICIOUS

PDF

82.8 KB Created: 2021-09-03 03:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d04efa270979d4ffd3577e98206bb60b SHA-1: 41595429390b16a982b0b3a3f198a12db6382b92 SHA-256: 27e43e66f8e08a59cec67984c079c680be9a4be6de4bd56c552e89430dd7af2f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to external websites, many of which are hosted on disposable domains or compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users to these external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 https://irlanc.ru/uplcv?utm_term=dinheiro+%C3%A9+emocional+pdf
    • http://creaorganization.com/depo/sayfaresim/file/tobibizize.pdf
    • http://klm-co.ru/foto/ck/files/27117157611.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607029d22da23---xopixunipafa.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f01a735256---wumiputuzarajelunene.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cae8cd7b71---kitidilekekipafagutopu.pdf
    • http://msslink.ru/userfiles/files/nafopiju.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9134bee4c---27401857004.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160750e7fac1d0---sagebu.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/fa28633e3a5b0c1376ef6a915e3c9825/92267687640.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834fc4868c0---xusesile.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/16e789c8f0e5422ba5cffa6d7f57c11f/69143545490.pdf
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/hb156apdjhrhh5fupjv4sknfn3/mezawusanebiwizunafiva.pdf
    • https://directorvincentchow.com/fck_filemanager_upload/file/52661069721.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/0939a85ffe7b37a114061c7598109e2a/guwegibimegexejutavux.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27eaa5d0cd---66274120598.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/7818ad05378110c6f70e7c535b024584/6160115068.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/b2hr88ja8nhvjcovub32h07pjb/22464319428.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/pm1mo2g1u11kj8o7t77iqrofn0/79229233877.pdf
    • http://suapaiatuipelehakefamily.com/clients/80707/File/74941797529.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f756b7abaab---xijabefinuf.pdf
    • https://xuanhongkhang.com/upload/files/difeko.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f6eabdff3---tutofafotesirakuliribinig.pdf
    • https://mannoorpally.com/uploads/file/79769350020.pdf
    • http://ventmetal.ru/userfiles/files/zaxivegenul.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dac4.bin
f6fc13423b9ae5cfc8cf02b04dfc8c332f43e0055b02f1b6bc10d6f411246890		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC4 20008 bytes
font_01_sfnt_off00010be5.bin
9a27353a16dbf7275f6594c0f22ad8b288b155aa370fcc446b5f30b76cf3ba8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE5 10772 bytes
font_02_sfnt_off00012417.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12417 16792 bytes

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