Malicious PDF — malware analysis report

Static analysis result for SHA-256 8754be98dfa871fb…

MALICIOUS

PDF

83.8 KB Created: 2021-08-02 07:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c8fb0d2884ea58d166289ac50493dcd4 SHA-1: 2aef3ef19cc226976f6f3dbea7072b3c3ad5437b SHA-256: 8754be98dfa871fbb3b2f78693c1155073c18fec6814e6eb8ca0b04a7adab606
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristics indicate the PDF acts as a link farm, pointing to multiple compromised websites, many of which are hosted on disposable domains or use WordPress upload vulnerabilities. This suggests a phishing or malware distribution campaign, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=how+to+fix+turntable+belt PDF link annotation
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/12e0fa815f6fdef64419c2520a67bf1f/juvebikewab.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/40736103900.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160775afd07313---tawupijaguwet.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/06/20210626135444.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/832036168dc58b6f6269d20c0c9ce998/jikag.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/da438ee9694191f404c7503545e88447/vejirasad.pdfIn PDF document text
    • http://afro-safari.com/upload/files/35987718584.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/webavovogedogavobimopamad.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/760ovsv55vu3o128cg4vnsiev3/89532571467.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/nepezebazibu.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/74348196474.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091715357061---pewukise.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609caf8c5d15d---tojerizumafidatu.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/3473234947.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609463455c014---minuzakuwojek.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6959b61c4---99258395715.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/31851454657.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5c1ecb36b---vizabupixitetitenolazivip.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/7d922d362266153db2aaed2e6196a42d/99618187741.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/fk1752dfotslvmkk7t8gli0s1p/serena.pdfIn PDF document text
    • https://soechi.net/userfiles/file/40258913119.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878aa3d70fa---pupajewovisune.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_off0000e7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C7 10460 bytes
SHA-256: 63da9bad323c636f3dcf058836e94a57a6be7443cb1d88fe81031ec68fb6d54a
font_01_sfnt_off0000ffaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BC 16412 bytes
SHA-256: c648605e65b8fc1e3d40ec6779d06924377445e5c8094fcf7b1d36e0b4a94e6f

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