Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f517de25d7ef169…

MALICIOUS

PDF

82.6 KB Created: 2021-09-04 16:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d7753194e30df467e9d137f442182c93 SHA-1: 6b3149dd7fcd06b8df2988647df6da50cb43c731 SHA-256: 7f517de25d7ef169d5bd51196c6565df4d16da842dcb1defb2ba35be773f4afe
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to potentially compromised websites and disposable hosting, likely to facilitate the download of further malicious payloads. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lacasedescaraibes.fr/file/gofuputitamoma.pdf In PDF document text
    • http://sattamatkapatti.com/userfiles/file/84980687418.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/5e8581dd95d0ad8fc2f0363c927b5b4c/guvevepanakepefuwibenotov.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///18532889901.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/43726600855.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/96707549415.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/ada61c0d0e779c886af100ade7b0c5c6/tapeluxadonizagov.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/99162095534.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/33738429820.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/c6t7lj02hhc0cs93hlcsvu5n4l/xanarulanapejag.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/73067362563.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/jixitujajet.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/kedovowelas.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/kubemugepapetalutukokini.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/82812468476.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/marozikusezezi.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/61664098846.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cad7430b98f---fupufutufoxob.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/betima.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/6ce2e888dda21c5480b5021c7e2faa96/92009888110.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/3e8805222d682249d2f091531078c24d/lovujewamofu.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/duxujikorubuzizorewaduzaz.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/59335329915.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/2859fbd6e90f71a0d30bf967835da23e/26288748534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=all+in+one+pdf+software+free+downloadPDF 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_off0000dcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CB 10560 bytes
SHA-256: 9588d5fc69471d2a1cacdff69458509aa7f80134b6a082ed6ded08b413655d20
font_02_sfnt_off00010d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D10 18444 bytes
SHA-256: f2d8add9a6d192f1e9596456bb9822b2e0d7382310436982a4edfa13264a4eaf

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