Malicious PDF — malware analysis report

Static analysis result for SHA-256 44aeae1efa336c17…

MALICIOUS

PDF

71.3 KB Created: 2021-09-16 22:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f232a0c0db959f88a0348cb71348f7e2 SHA-1: e6f1d0b170d22a0cc579a08eb2034af3f480aa8e SHA-256: 44aeae1efa336c177768d51c935ef8bff7b7d97409ab56048a2d750bbcd937ad
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm for SEO manipulation or malware distribution. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attack, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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://smidgel.ru/uplcv?utm_term=pc+games+on+android+tablet PDF link annotation
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb755f84e---92896926910.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/zigaxufogofupotagem.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/18061914488.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/82022347618.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/015c9519f67d404006665168a397d155/17463192082.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/powapivejalebum.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/73894487783.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/24775582999.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/73614411254.pdfIn PDF document text
    • http://standardamulet.com/files/files/625592569.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16131833658c34---puxonatipowelumanabek.pdfIn PDF document text
    • https://ikansambel.com/contents/files/fugop.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/5u3p37cokd1vo8sdghuqrphsv3/korovinapom.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/lixapewotesujafo.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/32724003872.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/49946987586.pdfIn PDF document text
    • https://polandpools.com/contents/files/mezediguvod.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/wudugexevinodo.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142ba345e07d---moven.pdfIn PDF document text
    • http://vtaky.sk/media/file/rutabazi.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/48609991281.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371a53e05cc---dodofuwitijo.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_off0000b507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB507 16520 bytes
SHA-256: 0a5cfff46f841adcd57f96f193ba9bd7a14ab6a909852bb213cddbb8f32784e2
font_01_sfnt_off0000df3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF753 10852 bytes
SHA-256: b3430c22c883d8d25dd96d6bd1a83ab95ac5ce912f95f65bd8ea439da7873cc0