Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae89c5ba3fd49bc7…

MALICIOUS

PDF

82.4 KB Created: 2021-08-19 19:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7f7e7fd9825cf7414e2872038b0a3195 SHA-1: e293342c0c7e96c22d914a7120d0369822fd2301 SHA-256: ae89c5ba3fd49bc78ca4320b3608e6237a4b82c52afd2527b97945a54881e12b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being a link farm hosted on compromised websites, designed to redirect users to other malicious PDFs. The presence of external URIs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16115e86babc7b---suxinitevujom.pdf In PDF document text
    • http://golden-candies.ru/webroot/files/files/59398137322.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202106181359447929.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/dusedudomatazokip.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210803025321_902039.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/durimatajarutodovafebi.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16073b1a98a92d---risowevosotavol.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b976bcc8d---bebagoja.pdfIn PDF document text
    • https://wsbtitan.com/images/file/41587495362.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/monajowebabofinud.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a0e85b5b4---12314663783.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bba6198a38b---sumuzewunujodaxakukuk.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a49b665a45---lajitibej.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecf6253f89---nobixobesilawara.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/sebidukojowap.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/9565432851.pdfIn PDF document text
    • http://asztromiskolc.hu/ckfinder/userfiles/files/fakawokas.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///wudokaxasabovenojigosij.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e33228a49bd---jewupuwezovode.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/vuxalifixo.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f0756dd3e---wumakesidovodivo.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/5e8877fdb3a3c6589755151490d0e000/42010811148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=huawei+mate+10+lite+android+pie+updatePDF 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_off0000dd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3E 17364 bytes
SHA-256: 77a325b3482433ecd98171b3b40b2557b9f752c85dd795833dbb9ff2e0e43bf1
font_01_sfnt_off00010adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADF 10736 bytes
SHA-256: eb7873d814c1d91c9a694f5fcf1c0670f6ea659467f33b0eb635bbb166099331
font_02_sfnt_off0001237e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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