Malicious PDF — malware analysis report

Static analysis result for SHA-256 80191fe440b39224…

MALICIOUS

PDF

99.7 KB Created: 2021-07-25 17:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5c20e1ccc0b166fec1ed2700f65e98cf SHA-1: 7eac7828479e1b6b9c8e347913929e6e766ba04c SHA-256: 80191fe440b392249d06975005e5a97682c5130bebc42dbcc1c39ac4e68e7665
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to numerous URLs, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://italiangreyhound.pl/img1/userfiles/file/22053921214.pdf In PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608719c957f8b---20057917056.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/tuzuzeruxasowilulunu.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c69bf26431f---welupirumapuzomuzovojise.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/bixotag.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/ee52d670855a381ee903f29147ac9484/62725571522.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b5089ab910e---vawigojirujogetosasa.pdfIn PDF document text
    • http://50wj66.com/clients/a/af/af9d65f11c1965a5434adcd4cd578f00/File/1371365024.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/434dc884726b8becb70fac13e2087ac2/41814551537.pdfIn PDF document text
    • http://agavietnam.com/img/files/bokiroxob.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/18649580396.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ee87a5f43---fujexakazosafe.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/fomut.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/40731604550.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/b69c651919eb24b4dff34a3567757ca8/vexofazilikixafovarejodom.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/dinogovapadipazokazakalo.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/cbe1307963db3c0b9f9c45cd53018503/xudepakewopomalonavat.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/61674317386.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607806056301b---26499116358.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/76469990257.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d6d220104f5---16325028316.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/5b2068c4370105f19f49d3d0e9936c72/20903610275.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/44483635075.pdfIn PDF document text
    • https://leavingcare3plus.ch/userfiles/files/25810691716.pdfIn PDF document text
    • https://hse.tw/upload/file/69687676420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+do+a+full+body+workout+at+home+without+equipmentPDF 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_off00012237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12237 11264 bytes
SHA-256: 21d93eae54635125ba322d34554349150a3e3bd173b1f0457273b35c1d3378be
font_01_sfnt_off00013c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C01 17224 bytes
SHA-256: f48f3de55a39c5f8e0e7430419236f8fe3570f68e48bccc4e1d301d505a918eb
font_02_sfnt_off000168ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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