Malicious PDF — malware analysis report

Static analysis result for SHA-256 037bca72c57a1503…

MALICIOUS

PDF

93.4 KB Created: 2021-09-02 22:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 27288becdb4a4ed801b9bc087182ab80 SHA-1: 861ca58ef3b1afe998163cb8eef90f950cba398a SHA-256: 037bca72c57a15035b5070a391b2e26437815ad7849dae374c5a0d91fd18c518
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://nomylo.ru/uplcv?utm_term=javascript+cheat+sheet+pdf+stanford PDF link annotation
    • http://www.aportecnica.com/imagenes/editor/file/93357949433.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/kubada.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/nodife.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/69e95b787d7001faeb76591e3d7d8ad3/66506946257.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/3e22c9890c3125f8d1af7232b08e2879/tanugid.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/9f027431c332f56d0ef74131901f9a60/55137441844.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/08a1cppgh9jqln2le3bmcgrk87/rabulekirasuxibim.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/52830548331.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/lejige.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/rolonulesezizupi.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/zifazezakigipazivuralefaf.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/zovebidusazikugebubevap.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/52695591251.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/v7lfht8dmmbn8poidlk0o4u1b2/98900589979.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/laxedivejajesiwif.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/puzifuxiri.pdfIn PDF document text
    • http://dallaslandscapedesign.com/media/files/wupozisanidojini.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/vuputoj.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/seviva.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/wulawabosasapoxegu.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53feb07e4c---5059626478.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071f35f7f31e---xojipasa.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/zaritaduxolimanewufakexu.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_off0000ee43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE43 17988 bytes
SHA-256: 5455243ce2bf3d8fb13bb5256de684c32adbbd17fe62d04e591a7816f798f95a
font_01_sfnt_off00011ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDD 18752 bytes
SHA-256: 91e6ac75d3e77d362b35e06ccc4dcd760e0cd27ade8136ed5f1a151d0b599d22
font_02_sfnt_off00014fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1