Malicious PDF — malware analysis report

Static analysis result for SHA-256 94dfea509255ac7d…

MALICIOUS

PDF

80.4 KB Created: 2021-09-01 18:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eab3f284bb2cbc514d5636a25b2f717e SHA-1: 3064f41473da80f6f413212782cb30cde5241f2a SHA-256: 94dfea509255ac7dd007e00a475543d64e3f4f5dec30c1de0fcd421b3bcdb3e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic firings point to a sophisticated redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=reasons+for+post+op+fever PDF link annotation
    • http://www.allatpatikapecs.hu/images/file/18766170430.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612905a594723---vesosorofuguramedorevif.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/19662021952.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/zigeberisitegupowedopobof.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021073015543673499.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/safafa.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/tepaguzozorisizobisu.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/bowobodazuvotara.pdfIn PDF document text
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/sedelipimuzizebad.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/66108543794.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b2f50b6a17---7777231531.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/1f49866961b19639f047255166612c37/89421953591.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/4cacdd28bd45051807a88ca4dee686c7/86461538579.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906fb5e7df7---14881352895.pdfIn PDF document text
    • https://ismart99.net/upload/files/fimiguwufebetozutozure.pdfIn PDF document text
    • http://alkanboya.com/files/file///sebaru.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/jomed.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/3bae4f0953bf58853cb057d4063df138/82184509023.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88d4176719---bizuw.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/mafozazotitigem.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/44516587903.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/46507331751.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/zakitixel.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_off0000d435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD435 18108 bytes
SHA-256: 56a08d8f07c03735b37049ab7da82105e2a30921461893d97161626ab9828336
font_01_sfnt_off0001031f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031F 10324 bytes
SHA-256: 2ba236705bd9654c6ab3d376336550ce305da7803f8e5b05a31f4342056807aa
font_02_sfnt_off00011a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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