Malicious PDF — malware analysis report

Static analysis result for SHA-256 1983d91a1ae9cefd…

MALICIOUS

PDF

78.2 KB Created: 2021-11-13 08:31:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 46c5f6be10ff7d85a0d200a4474cf776 SHA-1: fbda1326309c0ef1e24dbce6071331cda2630ad1 SHA-256: 1983d91a1ae9cefde3357a8fb2e59fdb1a2e77bbbc1ec1db717c510af2142008
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF-specific heuristics related to URI and link farms supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infoenergie-loire.org/userfiles/file/sejesuvinagojemekabibov.pdf In PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/peledikubad.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/98585741631.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/29871207646.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/90774829410.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/28019524596.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/87908458458.pdfIn PDF document text
    • https://creativetalentnetwork.com/ckfinder/userfiles/files/namobowenob.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/pupisefasedetekat.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/22588599487.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/65810531255.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/vumavutinos.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/kazupuvevalib.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/jetirijoraxilijapakotejop.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/72236783224.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/11309496811.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/24843107978.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/0334f71fd1c61fa169a62c4e3be15e01/liwutazikavebujet.pdfIn PDF document text
    • https://publiperu.org/land/images/userfiles/file/1311007308.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/kegibapupafusigig.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16173f8abbd0c8---napufolomomijidixajig.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/deladaluremosetuxe.pdfIn PDF document text
    • http://poorclarescork.ie/images/fawosewoxopum.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616823bc652eb---muwivuzulu.pdfIn PDF document text
    • http://dges.in/userfiles/file/nubepikeguxaxora.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/UsNeCLCzgYg/uplcv?utm_term=two+cups+equals+how+many+pintsPDF 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_off0000cad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD2 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_01_sfnt_off0000e1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F3 18300 bytes
SHA-256: a50b361ab8d69dce2e147a8b0e4cefe066d342dfa35ddeb6b75cd295fce2c12a
font_02_sfnt_off000111c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C7 10948 bytes
SHA-256: afd9b6acd2d83d16024cdef24d4f2d922f5887b1a30e8e26d0fd87af3b2168b7

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