Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee635a89e5adab24…

MALICIOUS

PDF

76.3 KB Created: 2021-08-25 01:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 6fcf7cccf308fbd5bd51020ae5e83069 SHA-1: bfef9a1e05a041183a99f851a40a0553369ea241 SHA-256: ee635a89e5adab2466ca72c136fa0e556a0280700f48390a6c1aadd5a0bb3990
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicates maliciousness, and the heuristic firings confirm the presence of external URI links and a link farm on disposable hosting. No scripts were extracted from this sample, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://allytemp.ru/uplcv?utm_term=water+cycle+grade+4 PDF link annotation
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/b7b007d309e8570cdbfc320493c1ad4e/14620008728.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a76ea9d99---55976944829.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c32c595b104---gogomawulenusazixifu.pdfIn PDF document text
    • http://iltorg.ru/upload/file/ravaja.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160efeb6ac3c05---pegemefogetobi.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862fa59f231---60104800597.pdfIn PDF document text
    • https://aaaxxion.info/images/file/457858035.pdfIn PDF document text
    • https://aeap.com.br/ckfinder/userfiles/files/zubinimof.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16085993cdf478---tabodutej.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/381a1a0424981f0b482d31b3c473cd3d/17719389250.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f00ec0b708---mudawisubirofatel.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/mlu3h268a23964p6lh7lia0nij/zexofoxananivomojavo.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/6f8a807411ccf52f77b1d23f84598138/46722089404.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087a19e4d3b2---fivib.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb7f3798c0---dojusizigupefimuduz.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fe03cd7e661---lufarasutofur.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/13205264620.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/22417549607.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0273836001621332592.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/gonawefalipiposemabeluned.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609065c2db3b5---safokalaxirabibodovogen.pdfIn PDF document text
    • http://solsethreunion.com/clients/f/f5/f56c6d7ba488b74ef40bd02d3fc4d0b2/File/mivatufedogumoj.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7f97c419b32a5b22f16e31eaee72a481/wivej.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc4594e1a3---vuvanumipurerilozixixu.pdfIn PDF document text
    • https://huanghecables.com/d/files/55835727855.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_off0000ca1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1A 15900 bytes
SHA-256: d17b9ccc3164298d3bd7a5deb807e5af3b1b8db8bd61878a902fc18ba43e77d8
font_01_sfnt_off0000f346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 10244 bytes
SHA-256: ff6faa1b927dc4a3f7f67c7ad8fbde8d0e5799f979ad55e0c90e0c8ac0166fb8
font_02_sfnt_off00010a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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