Malicious PDF — malware analysis report

Static analysis result for SHA-256 211757804aaddfb5…

MALICIOUS

PDF

77.9 KB Created: 2021-09-06 01:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d246887216227d62fc673531fcc13482 SHA-1: cc4943f37ac2a3595044feb469d53571ba25f936 SHA-256: 211757804aaddfb511526e6f1f4359c6686dcb1ba66d683977c8955d13281726
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous external URIs pointing to compromised WordPress upload directories and other potentially malicious sites. The 'utm_term' parameter in some URLs suggests an attempt at SEO manipulation to lure unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da7862614f---66440504865.pdf In PDF document text
    • https://goldenapp.net/file/26782474264.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6029c86978---gegewimuxijawo.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/nrlnjaas8c8h5uc68dq6p52efu/ketimexiratavetal.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/tokajujedaze.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/12227328181.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/lapelitesob.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/9c5858100d91ba65201f6836d1d03764/66604160678.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/18384914217.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/riddla6g2kbtlspeae29k6lrgn/42657065480.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87ffd85a3c---petiw.pdfIn PDF document text
    • https://flying-vikings.net/UserFiles/file/minusat.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/06169c4064b11a94ad63c5f3d391d0cb/bodevefepaburitijinegive.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/pomuxepetekabezosof.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/3f959b54f5b81e2f964a12a718821794/29073971330.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/7974a2f8fe671404a43f10dae27e82ce/44557868743.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b8183a5b7---ganurifazapelevabufeju.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///61177131513.pdfIn PDF document text
    • http://enricobarraco.com/files/91329828537.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210626084625_4n1yjc.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/22077110302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=parts+of+the+house+esl+pdfPDF 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_off0000cd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5A 10500 bytes
SHA-256: f9e3061fe1dc72977ef40d1a5919d043148e941edd2a3ebed9107d774eb9b077
font_01_sfnt_off0000e566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE566 17624 bytes
SHA-256: 2a56cdb8b0ca810a34719bfcaa4516526cc8ce652e132685f68c3ac46d3e9aec
font_02_sfnt_off000112c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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