Malicious PDF — malware analysis report

Static analysis result for SHA-256 36aa11ed0784780e…

MALICIOUS

PDF

121.1 KB Created: 2021-06-28 01:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 992fdeca3a93b6cd520b9ad2bd020e6b SHA-1: 877cce208930338302b770b8abc70ae1429d71bf SHA-256: 36aa11ed0784780e7681be1fced5a449348833c8099826914c2f32d7ae8ac4f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. These links likely serve as a lure to download further malicious content or redirect to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 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 https://huntic.ru/uplcv?utm_term=data+wipe+complete+traduction PDF link annotation
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/oiddmaasunuea07r5ksu5k7cik/xevisexagagesidagobuvoduk.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/96059652416.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/sinixi.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac18408cce3---fokowekuzuwipexunag.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/j6ej7v56jc0vb2qi3p9n03pcq2/xizuka.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/88440176699.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f09871f1b---zowab.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/88f9b9877c4e139e18b57a4155da70f8/joxisozenatudikilewu.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/e5e4a3eb27afe35de9b952b44d6f9903/zulavixajerutefiwebase.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/tamudizajusunixivosawerov.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6554385d3dc51a862689de522dab87b9/luxezaguru.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/94fadb1e96a78882a31576b633511494/nonepuw.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/retigotesenodatovigenexo.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a60rt3knsns9shjmn1nt84q4i/menudokobiriw.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/kevasajixu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5905b335a6---jerexawowaxesu.pdfIn PDF document text
    • https://starbox.fr/img/files/91771419785.pdfIn PDF document text
    • http://ropesadventure.com/d/files/jobijuvubenafa.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/7917d0ccb3e6a2e7fbd7ebedac451be7/bivoxugibomiradudaxogujiz.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/d3c813e5593daac9ff9c2ed8c6fe1172/10125135446.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/0e36e97ja0iq1g7r8lc4575h11/86089001530.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b086f5dbddb---gizil.pdfIn PDF document text
    • 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_off000174c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174C2 18348 bytes
SHA-256: d1a1944aaf2dbdb1759046640c1b93faa599a72bf82cf252f67679071e170ad3
font_01_sfnt_off0001a4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001bcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCDC 10692 bytes
SHA-256: fd64ce5d5ef577d0737efa80ff39dc4e36739d218857ae9a55ab2c4feb393b8c