Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d6f441c4a1c3739…

MALICIOUS

PDF

86.8 KB Created: 2021-06-27 18:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ba20aecb88f6da1c37bf1f401fb0407a SHA-1: 24ac14f7df12d922603ddcc454b629546ed6de37 SHA-256: 5d6f441c4a1c373926377acc2ce1aa2b1bbb787795d25403888b99b3377cf86b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute or host malicious content. The PDF structure itself appears to be a lure, directing users to external, potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://ajwatravel.com/wheelmarine/userfiles/file/wasimavozuwidubomuberip.pdf In PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ece853f034---54958875864.pdfIn PDF document text
    • https://osakadentalcare.com/contents//files/bekidufok.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b96df1ae---65054739438.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/n5tt01m4rte8dl8di81s0aocl6/31106164033.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/bamupoxunuxo.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/69746970469.pdfIn PDF document text
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/64294220653.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/23492149275.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/r8q9c8u8q2g5hd4vjetag63jnb/dulomifajodadenikewa.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4a88da35b---xunigu.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/12995813359.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/64250056412.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/5b57f1828239dedf26e3f9ef0f8a908e/79670906440.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/guxenediwimutakikoxep.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/56cd9cf693ddd17e2bd2bb7cb0bb930f/xomeditelaja.pdfIn PDF document text
    • http://elitvorota.ru/f/file/26919677269.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/56069225127.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/jukizepiniwudipiro.pdfIn PDF document text
    • http://chromavials.com/d/files/70860180618.pdfIn PDF document text
    • http://splogservice.ru/content/file/12494292318.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/35927037127.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/217d6cf62b3829487fd6452227817c8c/13809169302.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/feboluxo.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/326470eb0b9ffbcc394e368419c55c0c/nixikokoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=forrest+gump+song+pianoPDF 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_off0000f0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D5 10624 bytes
SHA-256: 550911c4c069498db99ab158bb1934016c5435b35142430df1710162e073f17d
font_01_sfnt_off00010924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10924 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12136 17224 bytes
SHA-256: 8350ff7b476633ff849e27bb50adae9c584fe2276f5100596cbeb16020382f9b