Malicious PDF — malware analysis report

Static analysis result for SHA-256 89800b6533a90092…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 06:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e982a1a25a6b811cbe8929e19f462165 SHA-1: d84051cd15ed900f7cf9e689ad31d8e8e9b0da9b SHA-256: 89800b6533a90092cde86f3817ff26b7795341e445e987987eee7464d8e35b82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further supports this, as these are often abused for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=prepositions+of+place+bedroom+pdf PDF link annotation
    • http://amongelite.com/ci/userfiles/files/89247444464.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/81752213540.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/26951619765.pdfIn PDF document text
    • https://afayl.com/userfiles/file/voxogurikepiduzidonije.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bb5a09b56---99218704736.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608529878a6ea---nerazugagufivasasumas.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/9b8a6001006e5a6c3d65ffed14573051/seduninigijuvidamekuxow.pdfIn PDF document text
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/leduso.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/vasigusefodobaz.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/rizozapaso.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/wigusujopobepa.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/segarikadak.pdfIn PDF document text
    • http://electric-kernbichler.at/nazawegosotavubokizusi.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/67485356315.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/6833367097.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/renojexitisanoragigaraz.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/65086964208.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/0cq0u36a8qkc0l3jcnbs1npcsp/77934187423.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/93e2e1b0557f13bf2fb9ddab033d1bdf/94086894437.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/jodexumatesiwanoguludose.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160731aad017cd---40462014750.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/fimusopefuriladanipej.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/vakerev.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_off0000d2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BF 10924 bytes
SHA-256: 845bd9e8433af85dd37082d8ab6eb6bd58065dd4a6e1beecd45eed7e9a5150e5
font_01_sfnt_off0000ebcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DE 19060 bytes
SHA-256: 52b11ee386bcf4cf4f718fa58a5298c5b6ddd2aa9d014bbec967c8e53456cfb4

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