Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab03f7642a7edf2…

MALICIOUS

PDF

73.0 KB Created: 2021-06-25 15:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f8af1cfd59f26e771a1ba284c50fb3d SHA-1: 76f5e09aff0e440a8fffca8cfc95c0d710a7d67b SHA-256: cab03f7642a7edf278811d62282dbc3c33fd1405769484f99f233b0729908dc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics suggest an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://temple.mo/userfiles/file/nafokusisaperir.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/b7facf06fac0cabd0a44d4f3a7c04380/23847757470.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/rowapaxediv.pdf
    • http://quaint-house.com/74774437540.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9e407f334---fofesitufuxasilof.pdf
    • http://joy05.com/_UploadFile/Images/file/58391704654.pdf
    • http://seksdagen.nl/userfiles/file/43775164121.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078ba1017158---ledaliravotewusorupiwus.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b53f567c1---36579451455.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c329b79352f---1252028445.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/9589496ef0a05ec2607723b99a20e90b/50882871177.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16088de4cccdc5---kulunavobogubap.pdf
    • http://www.dismaplant.com/ckfinder/userfiles/files/47030045998.pdf
    • http://2ds-creations.fr/userfiles/file/44873390910.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=legally+blonde+free+stream
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bae5.bin
6a0b658ef6a8d6d2a0e9eb34011ca64c185e70927d1912c43fe3337e001e6660		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE5 10816 bytes
font_01_sfnt_off0000d3a6.bin
32edc47e46c288fbda91934ccefc7fc99d7828f537dfd67be494da6fce8b0e5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A6 16784 bytes
font_02_sfnt_off0000ff63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF63 16792 bytes

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