Malicious PDF — malware analysis report

Static analysis result for SHA-256 a14ba96cf00a5e00…

MALICIOUS

PDF

82.7 KB Created: 2021-06-26 00:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2f53c360e31cd08c820f6cb271efe5be SHA-1: 45e88be4c00ca242e8f62a9983b332dcc2ebf071 SHA-256: a14ba96cf00a5e00068b4d884a4cb7568768267a5438ddbdf465c56facab1a61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to potentially compromised websites, identified by heuristics as a link farm and a phishing/trojan distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbb4bf1585---34963293679.pdf In PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/egspdikqrb933bukl1ncigdep3/radunisapodeziz.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/giwoxifesekanixel.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/96888557997.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bfae7611f8e---kigapaketevawurawe.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b727a10cb---toworupuwolelozoxod.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/75666344974.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/0acdb43d9fcc39f08b80c01de80610fa/sepinerew.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/58027461781.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/c9ca4e9eac8aaed114b137570e976663/52821222382.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6cf6837b913a70730fc5ed1f5b36eac1/doxanabozisolidovo.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/a5bdafe13622defadeeabd54a62f1e85/jupufajogebizopar.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/70610366588.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607947fe03e73---mebixusefurawazikifadumu.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/og16q7fi2627knsj3u2chl0bi4/duxogeteb.pdfIn PDF document text
    • http://www.asslar.de/downloads/52634698769.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ed44aac1f6ff988d3ffe17f8ea31c0e3/nogatebajed.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d09269c060f---fanisumebiri.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/barojunefuzowu.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/5oq6mj5hqu6746a8rudi5mv9dn/96938479374.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/1e5e6f888fc3019ca3c1385aae4a3bc5/52817507848.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160805310df779---39442388073.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb28a92d290---6953215775.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c9af1e2aa44---wafikolen.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/9f9e3e424efb1c7d0f7b2307b0541666/puxaxodawizomawalaxal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=house+wiring+neutralPDF 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_off0000e285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE285 10460 bytes
SHA-256: 868d7bd021c823392940cc3bac0846dea397775aa71e3056ea58f3a87255f71e
font_01_sfnt_off0000fa6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6E 16588 bytes
SHA-256: 6bc5a0fb9a7ef6425c41045498ba9e90ce5fc1774b791506f5efdf5f148f13f8
font_02_sfnt_off00012591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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