Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e5ed4c61c2dc427…

MALICIOUS

PDF

86.8 KB Created: 2021-06-28 12:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6a4c7a6d27984cc50da4370185e7b2b1 SHA-1: 2b845276c079299df980024ccefab2f78abeb60f SHA-256: 6e5ed4c61c2dc427afd89b3f57cf62bbe6a7446842447499ccc000c24c1dad68
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are associated with compromised CMS uploads or appear to be disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://auapp.ch/userfiles/files/16885634967.pdf In PDF document text
    • https://ludbaegitim.com/calisma2/files/uploads/61917150941.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a6e45013a---73073667636.pdfIn PDF document text
    • https://noddy.nu/images/file/tutajodubuxibimi.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/nifinotanovofor.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080982f2be51---41496003571.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/tavufixubesewarosuvi.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/46724736170.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bf47cf091---valukogiru.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/sivumavusapa.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/82167504714.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/u3c91m6jf1qhabtrnp81gjqv8i/zegila.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160775e3708a2d---pojozoveso.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc7a999eb5---36578379332.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/8e8j07a4fmgho3hab0iggo81rv/30381437739.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/jonolenuvijadozoxi.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/zilexalojufuriz.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/ba8adbbcd34c2adca223c69ff1f341ef/81338121212.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/fesilakuzisimenoxez.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/80240247097.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/82182201037.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/40612067647.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/6rehgjc8kttpl61369fd0k7d38/90068606170.pdfIn PDF document text
    • http://doreenindiatours.com/userfiles/file/zojemasunegegodimelulaw.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c29723b5603---sitetenoron.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=stopping+chemo+because+of+side+effectsPDF 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_off0000f13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13B 11236 bytes
SHA-256: 4109dc5eb3f967781a893f1db14e4bc3040d37ef92a8ce928adce5d5f73c9806
font_01_sfnt_off00010afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFA 16480 bytes
SHA-256: 1deb3ec524c85f6cd5789c97e780f149b030ff04fa6110bfd337b6073a4e8319
font_02_sfnt_off000135c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1