Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c9cc7dbdda0f36…

MALICIOUS

PDF

86.5 KB Created: 2021-07-04 03:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2fada6fa45a98db02587c982b12b6f01 SHA-1: 16640731a7e33b20371647ec44f5ec2493e77a83 SHA-256: 58c9cc7dbdda0f364f4cd95c751148ad8538e000150f513f3472cb319ba3bb15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains numerous links to compromised websites, many of which host other PDFs. This behavior is indicative of a link farm designed to redirect users to malicious content, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly support its malicious nature.

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 https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df020d3be1---retibaxelafobikimabokisej.pdf In PDF document text
    • https://rugsinc.in/UserFiles/files/zebuwelomijo.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a34d48e4a73---masijesuxokufukeronumom.pdfIn PDF document text
    • https://tonitomov.com/picture/file/mipimuxudebejojiwonuma.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/daxizowisavi.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b7cb2183a---siwimifusaletole.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sugofodapenik.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc4ae2b159---rebakiwanunofowulepozu.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/xejodulunijax.pdfIn PDF document text
    • http://brukbet.com/user_images/file/jonixomunozoratugopoj.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/4941717798.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/puwovawewozikowiwabewu.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/394eb4ba7055c90d54aa6be293da4aa4/87943084063.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/6360323124.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/52600797645.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/67edb7d3b6b8ccb5c2cc19c682ccb88b/lujonomatitafaru.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/dc948f6b716ae9c5b54af0e7d4fddd9c/jukutolu.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/noredudukef.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/32152967127.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d77acb45e---janejagufajukonewalomitu.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16096bc733a569---xixamutipusoxapepal.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/65evio42s7b8qeg5cgtho32qej/20662845842.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/34819350809.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/fe47be834f43ad7402f0eca7f2f8e132/16521650584.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/89774628308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=two+step+flow+modelPDF 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_off0000f03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03E 10248 bytes
SHA-256: 7ae60bb271794cb8bfd4c7b6df47d5b439e52be66347a630b225071bb6e86fd9
font_01_sfnt_off00010762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10762 17480 bytes
SHA-256: a745455256d2f62d916a4641e3df69312b0c2a20824af2f8146cc0687685d348
font_02_sfnt_off000134d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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