Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbee9af07b5d77a6…

MALICIOUS

PDF

84.0 KB Created: 2021-07-14 05:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cb4b47f648344ccd9513765938faa041 SHA-1: d97e42442d0b584252895e32ce72c34296a5f269 SHA-256: cbee9af07b5d77a6f96ad9578c4f64b417e04a3cc115781dc9922ed5187c48f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a network of links for SEO manipulation or to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://oniceh.ru/uplcv?utm_term=red+sun+in+the+morning PDF link annotation
    • http://alpha-th.com/userfiles/file/14862160066.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5b3648116---faxujebufa.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/2b9rsisaqfo4r67i7rgutna622/mujixasefopakopabomuguj.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085b69895aae---8888495258.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f85ea9c51---37714741756.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726a5f54905---tobelovorena.pdfIn PDF document text
    • http://orsolyajuhasz.com/ckfinder/userfiles/files/zumavopu.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f1ce2f43105e56658ad7827ce3b3d9cd/89093150415.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/tisonepadudevudezupuzi.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/bitekewalolebifimolemepo.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/ec6111510ba34c5313c9db01a14d4949/60738632493.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/ruzajoduvirifavimamowip.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/tanugeduminivuvamuzixa.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/74486603535.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/14247393055.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210627234619.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd7ed0d976---sosukejax.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/80024938837.pdfIn PDF document text
    • http://cga82.com/admin/File/dududugopefalebiwebefax.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/64788530851.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/47066068354.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96ee307527---51846133076.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/83022980089.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/73697231701.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_off0000e3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CB 10632 bytes
SHA-256: 3a69e520a837283c3228522048cf3b4c5a9a7906544e4491a0d5cb475a1927e1
font_01_sfnt_off0000fbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C8 17888 bytes
SHA-256: a8d37b7cc4e5d0608508a3567b9c10adc00a5047756f7a5dd2714b2298c33427

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