Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b694979f2362ed…

MALICIOUS

PDF

80.5 KB Created: 2021-09-22 11:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0d1e53060d363c8495b94cc9c52966cc SHA-1: 72aef48bee9527b6c6d119d063f358dd67567e7b SHA-256: c9b694979f2362eddf7c7f4f0e64beab024cda3608b93cbb9a5902590b7f837d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=cod+cold+war+free+cod+points PDF link annotation
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/jerigifas.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/75204051383.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/90802120195.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/89466306861.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/kikorawowexir.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/14037970802.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/rorafixofutatirozizujebo.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f03d73d5a5---39052200885.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/53532933339.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/zufatexupa.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/jetemuvaxuretameres.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109201421365830.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/76656314321.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/lixediditekenikanozim.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219102357117549.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/58981756308.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/8dec32f894c8bb5f1d8691313365f266/3222971337.pdfIn PDF document text
    • https://aksusu.com/upload/files/56989038655.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161460cf15d720---92227545613.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/4808551415.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/fibanegufasagur.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/vefetodux.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/gufosotowadiz.pdfIn PDF document text
    • 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_off0000c872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC872 10728 bytes
SHA-256: 874c5b2adbc68e43a2fcb4c58fbc5683832f90a57f222d3033a539ac4157a0ad
font_01_sfnt_off0000e143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE143 22548 bytes
SHA-256: 7dcacdd4875a3f05b849568e4467e9d15cae5df556fa7ab66ec3088b2b23155c
font_02_sfnt_off00011c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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