Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4cd2a62bf6d648…

MALICIOUS

PDF

113.2 KB Created: 2021-08-31 12:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9bcbb119295950243c3d9ca72f2e5a4b SHA-1: eaf0d6edc9a8788faa7024392d8c3800ce95579a SHA-256: fa4cd2a62bf6d648e7b09726fb2dfef5ee0bea060e0e7c5f46da79f42b2b3a53
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608794e168451---45910515541.pdf In PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/34db04f9687b4356c4d552683254fc8b/74549362557.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/pulofonoxezibisakexezoxi.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/xumibugufodu.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/betejuzuzetogemizedovezu.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160deef285d1f6---14149207767.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/27361254525.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608009d197b0d---kafabesuba.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/poxalusotate.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071556b4c586---bejop.pdfIn PDF document text
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/rijenafuwenaji.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/kuzukosakabig.pdfIn PDF document text
    • https://digireg.com/upload/53973673914.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/aab0c968ae2333d4e9b51e040866a5ae/zakikubomibovumobeputenuv.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/sakiza.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/27667389987.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/6be78771a2991ae319fddff0829db833/sogizorela.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/20fd4938181af2b59d7ccfee12ed37b3/96231991094.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a025be3ec5---bixoziwemaz.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/0e33o2s1rrhtj3q4ceq74bvbng/61608871095.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/vidunokolubizujulilig.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/hvk4oamc01o2pp9c0r4tkvmtmc/70193468928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=whether+should+i+or+whether+i+shouldPDF 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_off000152eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152EB 10260 bytes
SHA-256: 3ef193017f5a706b1b3c88ae3368431d41ccf9cb251a65d6382c66fb10267206
font_01_sfnt_off00016a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001823f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1823F 19872 bytes
SHA-256: a12fcd33428fa4ab3ca437ef41d0bc22770feb7fcca2db82d65b2645fe1b31c9

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