Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5759492f0bcc1f8…

MALICIOUS

PDF

98.7 KB Created: 2021-07-15 14:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 38351e027effeb61f3f9338ccc859ccb SHA-1: bee767026debc95e4423deaf0814d1b211b4c91e SHA-256: f5759492f0bcc1f83b5d6fb95593be0a749549b83e7bcd241edae62cedd63589
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://phongthuyphatloc.com/luutru/files/kanozaxodizu.pdf In PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16098852edc67a---pujodopixive.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce7f97ebf2da52a5ad136d144c03ef2a/maduput.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/xesejo.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16247583024389.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/85415913819.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a0aa32892---xaxixadifu.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/1cc744d66647adc63fbd2de9178c62f4/90413293460.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608584144c234---50049382148.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202163167361422.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/97215610529.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/36157818284.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/64162873785.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b45d3bd46ddae2edc2b3c8142cdaeea3/46896674891.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/65878715918.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/56950210707.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9769e0956d---97566846275.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vj6nk6e748163pv7839s6s04a0/luvidufabukefunu.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/1953248599.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/q51riftpj6sedf571r4o3e6par/36647729027.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/45734868182.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c74818faf0---84974755316.pdfIn PDF document text
    • http://ildiko-szepsegszalon.hu/userfiles/file/54965910846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=motion+in+straight+line+questions+and+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10632 10852 bytes
SHA-256: 9924f2bddd73df134ad4a2bf7c5b530e91c6f9584af96fd4f6358acf163b5ef5
font_01_sfnt_off00011eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB3 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_02_sfnt_off000133e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E4 18288 bytes
SHA-256: 3919c90c8c8b761a9e8b47256d67a3ea9d9c61dde7df754cc2f7665adf6c213c
font_03_sfnt_off00016496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16496 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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