Malicious PDF — malware analysis report

Static analysis result for SHA-256 70cac2d6e5ddb25a…

MALICIOUS

PDF

115.1 KB Created: 2021-06-25 19:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 896257e8b96e9c3950da32eae5f7cf13 SHA-1: 4e82fc7330b113e7ae5965e54fe93488061748f6 SHA-256: 70cac2d6e5ddb25a1b4f2fa8113cdfdc19f734f479671fdd7e0d9ef8cbd50f4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories and other disposable hosting. This suggests the document is designed to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://www.companyforte.com/imagenes/editor/file/vitimeduwanarelex.pdf In PDF document text
    • https://lesura.net/userfiles/file/39287271186.pdfIn PDF document text
    • http://tipiland.net/upload/file/93047389864.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/db4a051933bfdbfd614ef5f07cb1a47a/pikoxuxarobonaf.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/golibazevevepofekixajasa.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/viwobilolumivijodonavogab.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/risudedumosakipug.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d65d1213f---34731708821.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/74786231601.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/57141856500.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6a26d069736a025a55ca1c3de198d1d3/74159988985.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083b6caad96d---vemofukowivimotejewejo.pdfIn PDF document text
    • http://domainecomps.com/documents/files/ligikivimovixadugujar.pdfIn PDF document text
    • https://biocoils.com/img/file/nagovogelonavir.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc293a40f8---borenatoxudukekumezir.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/wexaxaturugaremexeropimis.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a22d0a9de3a---23055913853.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/34616264797.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/4996648759.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/gasirejipiwades.pdfIn PDF document text
    • http://soupworld.de/upload/file/xujuwotevevadaxezika.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c4de43f0b---sewos.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/b72cefb6514c71ff723d1a1bd40044cd/vumura.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/38097929826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=rounds+for+choirPDF 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_off000161b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161B9 10280 bytes
SHA-256: f3abe8126f394005f270a65a8c6172e3aaf2a08c107297fe92d90471b0d70c1a
font_01_sfnt_off000178c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178C6 17412 bytes
SHA-256: 904a3015cc8ac12cd76c0b34c76e9206724d88a33ee20e9da1da66a715fd1819
font_02_sfnt_off0001a5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1