Malicious PDF — malware analysis report

Static analysis result for SHA-256 044526047333aac3…

MALICIOUS

PDF

84.2 KB Created: 2021-09-14 21:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ea1c6a99171ada4e5921d466d3194326 SHA-1: 5127c31b027e2ab83a6c255297454e1cd652c051 SHA-256: 044526047333aac3e30a66de01b3f830724a4f196fb7ecf7a0294ddcf47aad9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=chuck+palahniuk+invisible+monsters+pdf PDF link annotation
    • https://makanbanyak.net/contents/files/5806409829.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/vakidusabadabaw.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/47852859063.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/dozemigu.pdfIn PDF document text
    • https://granitnet.hu/editor_up/37082132607.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/31514394153.pdfIn PDF document text
    • http://berbun.com/user_img/file/bexozewu.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32650132250.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/dibejuwowumixusasakox.pdfIn PDF document text
    • http://word.mn/uploads/assets/32397937160.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/sovamobupudigaso.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/83870387387.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/vizamiwafewuke.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137e30943f3a---kidululewutagoguwigep.pdfIn PDF document text
    • http://pjteam.hu/uploads/pofirutudevijolewoditas.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/14156397270.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/64699241480.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/ueb35n0cotkepe3f4n8pukmkt6/9450315672.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/vomawikis.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/putokiwoxuvomeduzisitem.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/afda445e8b9756243eb6f56be44f5a00/34654985359.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/varofifutepanopadavog.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/52779094330.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/ijnvk7jcidkip8b80emdtk7tb4/62865111384.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_off0000e05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05E 11316 bytes
SHA-256: f769ef4b960c2d25b40f2a353c3587dd3c8eb6e3099287a976c59cdf46389717
font_01_sfnt_off0000fa97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA97 18564 bytes
SHA-256: f701d0844b583364c43cbb1c1ab195d420a9a4f7301ea97a2ac0dafe07ad4b09
font_02_sfnt_off00012ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1