Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55cb5854d5aa724…

MALICIOUS

PDF

73.0 KB Created: 2021-09-15 16:36:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 758feffcdbaae0f0d8eb50345d2179fe SHA-1: a8e9f88d9e7b38188f1456721aa29653f2d8cb70 SHA-256: a55cb5854d5aa72443f0eb122d68aacc5e8b80b4c08442d67c3e1d02f2db0786
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically indicating phishing and trojan characteristics. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites or disposable hosting. The presence of these links suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://allytemp.ru/uplcv?utm_term=gledanje+tv+na+androidu PDF link annotation
    • https://lordoptika.hu/files/files/98904875984.pdfIn PDF document text
    • http://veitali.com/upload/files/beramisopabotid.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/jabutuzojen.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/29722348478.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/98987524213.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/89536539739.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138b88992f18---jemalerelebunatonodivaj.pdfIn PDF document text
    • http://spakimthi.com/upload/files/tawapoxi.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/63639618378.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/41180875041.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210914_13DA3D265B64E544.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/dedowezidikulazilowe.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/govubi.pdfIn PDF document text
    • http://perksys.com/userfiles/file/55790925851.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/29293754067.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/kuvasavalulorizijiwaxux.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/novarokaxu.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/wodigupu.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/64119398073.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/74714908780.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fe8c2e5c8---84413582866.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/e5n30l6ovngvkha54nhrr98uc3/zofafipomur.pdfIn PDF document text
    • https://profesa.net/userFilesfile/nezesuwosutokonebopudak.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_off0000bcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D9 16304 bytes
SHA-256: 00aca8289c63e357aff63e6d2644c773b3dfdd6bc8e5eac4baaed4b8f8876a40
font_02_sfnt_off0000feb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB7 10408 bytes
SHA-256: 61b0b8d2a959e2d4ac678137178673e9f8ca5807659e5d096cad69379bc88231