Malicious PDF — malware analysis report

Static analysis result for SHA-256 542b1f5c18f7efc2…

MALICIOUS

PDF

77.4 KB Created: 2021-09-02 07:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ebfb209dc9d1b803de73a9795b82c252 SHA-1: 6ba560805f9ca9a5a9d0ec0dcc877011900643e2 SHA-256: 542b1f5c18f7efc2254998d94ca460c1779c8889b3b9fd6293f5cddf134d3003
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cowichanseniors.ca/userfiles/file/21415316552.pdf In PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//monipowuwarivagenup.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/qlbq82rrk7dr0gess2u09n5uf3/jelepaxuvas.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee92ce54a29---41532494088.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608844496ac42---sobefipabidevedudowoxula.pdfIn PDF document text
    • http://goshaggers.com/clients/2/2c/2ce39afd4341152949bc146f79210d6f/File/99867922414.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/72754605209.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/85aa8ff047d0f54c45454733dc592a04/16374156295.pdfIn PDF document text
    • http://klefmarken.se/upload/file/36382422936.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/b0556d7377e9dfb330116b98680502cf/manuniwobizoridakituxelew.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/26048136009.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/nusajamufetosubutilav.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/70427825030.pdfIn PDF document text
    • http://ailizia.com/userfiles/60338136319.pdfIn PDF document text
    • http://nensi.si/upload/file/valalawetojinusevinerut.pdfIn PDF document text
    • http://polipack.ru/content/file/lisidajovut.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8b56409a0---xikoridozusagijejumof.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/wuximuz.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/surinuxojunub.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/bijiwamuvale.pdfIn PDF document text
    • https://luminex.pl/upload/file/fofagaweda.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c368080892---16967815409.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a2d75396e---gilewupukolon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+lorax+activity+sheetsPDF 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_off0000cd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD80 16608 bytes
SHA-256: 0ffcc4179118f8d5efd841340b0324fd0fd3f4f5b42324df314ade741a71e653
font_01_sfnt_off0000f83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83F 10468 bytes
SHA-256: 4a2dfd0fe58fac99dc334eab38790cf6cc2caacd75235b6aec98caf1361f1c77
font_02_sfnt_off00011046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.