Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3436fdb710fb4b…

MALICIOUS

PDF

82.8 KB Created: 2021-09-22 17:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e8ce968c5ff06d293ad9073b11dd3a65 SHA-1: 77371a49254457d83f26d3e647b40284076558c9 SHA-256: ff3436fdb710fb4bf938b5d96776e30ca917012e62c5c9e0560e01ca6273abaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crmrealty360degree.in/userfiles/file/goduk.pdf In PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/d6eeqi5rcmem5c2oe20c28j558/49166661339.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/43575072447.pdfIn PDF document text
    • https://paradigma.bg/uf/file/pekigonoluxatibul.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/jobixufubavepovosero.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/21721247959.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/vaziwazabapepesumorepeb.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/72874174870.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/zabodijefodoxake.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/gevutubuwezonukuwizi.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/notapulovobabosebiw.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f154e304dc---14817973650.pdfIn PDF document text
    • http://topp.pl/_topp/file/begilusoka.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416f2ef03ab---nawekaxezarapizezof.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/62323320945.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/51945134408.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/perawetixige.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/bemukuk.pdfIn PDF document text
    • http://eko-uklid.com/files/file/69866779001.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/64346138286.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/3304344644.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/vefejijeninidalovoron.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/zomokewelojufikalurebupof.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/29605727683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=connect+two+bluetooth+headphones+to+firestickPDF 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_off0000ddea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEA 17456 bytes
SHA-256: 284c2773639f1bf22a68bf9fb6512cc6252565a3e2789cec6485bb42614a1ab9
font_01_sfnt_off00010af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF3 11164 bytes
SHA-256: e49771a595953570ff060267cc2e0cb1a58aa0c14a2e48b62a7b54241a689c7e
font_02_sfnt_off000124db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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