Malicious PDF — malware analysis report

Static analysis result for SHA-256 616e4d3fac1ab3d7…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 04:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 98ddcec1ba26e8ac0a027fb9271d3c1e SHA-1: d2d5f6fff9eaffdba4da8933169ea1d9dd4d27d2 SHA-256: 616e4d3fac1ab3d725d445fc37920b8d2364aa055ea67fec5059edad2b2f0c27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=play+robot+unicorn+attack+2 PDF link annotation
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161306a97919c1---16196528985.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/ferizos.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613525b633ae9---1489090648.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/zovogefes.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4bcd5097fb5fbee5b9fc59793dd33be2/jafapatu.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/zemepujove.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/vudil.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/14819579194.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/betago.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/7a48293b866e0ad6650642df36005bc6/zutevexewaxupe.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382d0e4f119---kukemarolamoruguvufizidex.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/82252517151.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/nosapovagos.pdfIn PDF document text
    • http://vo23.ru/upload/file/89258440542.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/binid.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/nazisufopadudewixukinen.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210905211002_xps9g8.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/78492297291.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/33504363260.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/26398167789.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/juxevixevuxapomitaroves.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614435ae9af01---60351858643.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/19115510970.pdfIn PDF document text
    • 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_off0000dd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD68 10492 bytes
SHA-256: 044da51f619fb5b29a4e5384e8b41160e3787a0cd668636a118054c0e456553e
font_01_sfnt_off0000f573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF573 17496 bytes
SHA-256: f0598b2dead8091fdfc72747f78d2aa9b6d6fc27bd03c178e5c1c725c5e09613
font_02_sfnt_off0001230c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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