Malicious PDF — malware analysis report

Static analysis result for SHA-256 32807950df15f7f4…

MALICIOUS

PDF

90.4 KB Created: 2021-09-02 03:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e22bd8183f95ea8e4af2527cdee9a280 SHA-1: 21178f4b5ddbf5046c07bc95aea7ff11d5b11944 SHA-256: 32807950df15f7f409f717bf5ea19242ebeb91adb31d34914106584053b74a3c
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/nouklgfhq9m2cdtbuko0pl8fh8/poniladojowewigizixej.pdf In PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edfdd1abb9---juzupiloroviruvojataxur.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/tagusozozona.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/wopagakigibugilur.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/2vhep04mscjdckr2g2fhqlp139/lolekipaliloxesonusajo.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/vipunezotije.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/995be81a96c03878f720ae2e9d207c3b/vifafovekiwelowixokujo.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/ds999gmb451393pgebc5fr6rd1/14212949504.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/bonazitewidupunijenevu.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/gerupidagarunolomenozef.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e6d8bd10e668ba684911e57efa7f46ba/rizafebogotirekumedafo.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f9b6d50eda6---kagurez.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/tuzamekizovegu.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c7533c43ebb8a61ca8571edcaf7156bd/16337981881.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e4bba3f2b---mazuvido.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/widipefexevimesiti.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/63032237851.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160988947bd41c---6696413102.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607157516b704---pezifonawowefuxoruk.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/65166742670.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/nidebowemewibenogobuvo.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/pobugoto.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ae46599b602844331d2e5880e6670c1f/65288115079.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/39789733932.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/69912571659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=stage+clips+microscope+definitionPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11300 17948 bytes
SHA-256: 4a055039a37da13e3dde890ff26b4a80b8e43dc720c98ff10a5d2a565859184b
font_02_sfnt_off00014131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14131 11040 bytes
SHA-256: 93fb24a0f7b5d5201f5cba07451032bdc3e5656eaf7683870454eedf82047db2