Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f1a72cf1ef9c174…

MALICIOUS

PDF

91.7 KB Created: 2021-09-04 20:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f2782961f09ec434aee31041dac8ab15 SHA-1: 8d1da49a0bdf8c8b2a25f96e92b49fa58103c0bc SHA-256: 1f1a72cf1ef9c1740b405da619a060be6121e9cc57c22e5048e35757b3127dc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/868c2b15e88399641e8afa3f47276bf7/81061508473.pdf In PDF document text
    • https://pinyardim.com/calisma2/files/uploads/88466388767.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/82100459481.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/vifonidurev.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/bowapinifokogulaniderad.pdfIn PDF document text
    • http://qqsbg.net/uploads/file/68654037544.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608455d71be60---90828743681.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/1i66dbkc8u4bls7q2c0gme6772/jurovuvevapeg.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/gunix.pdfIn PDF document text
    • https://kultmotor.hu/images/files/52708592365.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/5dd09215936669812b0eef116772c6f1/jefimifawesotafuxemefu.pdfIn PDF document text
    • http://goldmustang.ru/files/files/8227786276.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b075471b5cf---49437800253.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611b3a5e97d1e---21647423283.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/a9ac9f66b3156fee72501120b609c1d6/8745661162.pdfIn PDF document text
    • http://qzgj.cn/upload/file/fereniraj.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/kexedaponewusivomimo.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/rumutijuzolosokakomoz.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/temenekifewiv.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/80899e783533368d9a57629ce4727a81/69937738774.pdfIn PDF document text
    • http://ecotrans.vn/upload/userfiles/files/wofuvoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+is+technology+pdfPDF 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_off000101c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C2 18020 bytes
SHA-256: b68d763935bed8e68a5f70bda9303dca631c066681280455fff71334f0bf3e2f
font_01_sfnt_off00012ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF9 10908 bytes
SHA-256: d38cc3e695f17c1c5c51faab3754bb707ca2c414c0eba9dccf3f2898771b1403
font_02_sfnt_off00014900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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