Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac7bf0b67050dff…

MALICIOUS

PDF

91.4 KB Created: 2021-06-29 10:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 60d21a3e85b101807fb36188797c39e6 SHA-1: a5064b2ab03c8a3ff4a5e9b4362f2b6b42cdf6c1 SHA-256: 7ac7bf0b67050dff1eb65156fed594948679c91b987700daed758770fb5af492
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a phishing or credential harvesting campaign. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is used to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://allytemp.ru/uplcv?utm_term=kid+refuses+to+do+chores PDF link annotation
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/kujorekasaditijosed.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/58974071786.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/88f3551fb37d28408cb84e8279407b20/4913163829.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a87895767---vujob.pdfIn PDF document text
    • https://austarpharma.com/upload/files/40866471431.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/8c2cs87na24j1rsr858s0bpoc3/81102174706.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/97435335829.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d71e5a521---89668611706.pdfIn PDF document text
    • http://freeski.hu/freeski/file/bejivo.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/qppa99aivetd3uh748mauhq4sa/rexanasuxizogukaveral.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/giramotawimitetamiwiwa.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee939c443d---dobumawojom.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/rq9avq28vs8ac54c58n68qt1jr/rekiwin.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/mamovigagiw.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92902b552---32272652864.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/99190480535.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608de3db52f4e---gavenesogi.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/77938546022.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/68500467029.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/fujizepolivavogil.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f301347f0---liwopuni.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/93691206439.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d288508f73---lozitedorimoju.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6c2ce629ff0dce1c43ffb0e48c832b1/10927366201.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ac53d5f1260---54268332842.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/37edc3bb8c2bc374c0958d8bc3facb8d/fusalofemapaveguzoj.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/76s9kl77ltr073k9jfggm8gugg/90234192233.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/edbc9aa810b37775c8eed04fa490044e/64038095146.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_off000105d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEC 10352 bytes
SHA-256: 9e6550dac4298f4355cd1c41336f0d0493c8339b048109ed2893f48a5f049900
font_02_sfnt_off0001356f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356F 16524 bytes
SHA-256: 1a2d78e37f77d18fc1adf32f7f96b14857addac9923d87b8bd89d1820f87b01a

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