Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9f785649b573e5…

MALICIOUS

PDF

82.8 KB Created: 2021-09-14 11:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a003aef306897d3d0d0669a94453d710 SHA-1: ca7eab13c5eb721b18ea060028e67a375470da67 SHA-256: 7c9f785649b573e56a9efaae92b8f4236424d6ebdcb72857c093077ad54cafc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

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://happy-land.hu/editor_up/67091054989.pdf In PDF document text
    • https://saunadlaciebie.pl/userfiles/file/pobojobugagipejes.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/1554753726131f43d0129a.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/dakol.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/jaxare.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/duxekijugajazawik.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/28797200711.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/70689151439.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/10038419626.pdfIn PDF document text
    • https://anfauglir.com/images/file/58806175152.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef75b43907---dusoxememowivuminuwevanub.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/toxajetitujinevirip.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/16452727651.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/99767995779.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fca55bc712---kesuwokibamovug.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/069f12f5fd5f0be2175a3fc8754cf4ba/22147489066.pdfIn PDF document text
    • http://kmsenior.org/file/files/lobuwifafikudixezitokuki.pdfIn PDF document text
    • http://bndweb.nl/upload/files/76290986503.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/87452684773.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/12705015154.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/1e73o6jm3ojd8ld7t1ad7808s0/66474167322.pdfIn PDF document text
    • http://unleadedcoffee.cz/soubory/38337141257.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/64703185151.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/80453203459.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff52f6de48---zegibiduwavotisino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=android+call+log+icons+meaningPDF 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_off0000e0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BA 17076 bytes
SHA-256: e142692186bde74e814a95d376474c321c56b18ed74060d138fdf70ec3abb5b9
font_01_sfnt_off00010d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12541 10596 bytes
SHA-256: 36b0d270c05bbe2c5fe4fcc3606e97e196a72593f58a722ec58164c4a5fe69a7