Malicious PDF — malware analysis report

Static analysis result for SHA-256 d169cc97115f5443…

MALICIOUS

PDF

79.2 KB Created: 2021-09-01 20:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f287b45754cc1c7bd8d7b5e1e6709002 SHA-1: c0c4b1e369e670742a0e95f7ec62b24f6fe30724 SHA-256: d169cc97115f5443f2c680e1349dc2bfee48cf419eb405eeae42836be20f38df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute further malicious content or phish for credentials. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/058dc6113eb4bc3bff70d16a9815a4ca/2668800886.pdf In PDF document text
    • http://hodinovysoused.cz/upload/file/67148412800.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/bovewe.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16123b3b32f9df---bugowa.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a610a8b2a12---legagaroxegevosixesakak.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/90252335177.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/0mosjog3lg8cdfe76rk1rma6v7/rusakojike.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/f7937f7c8ebe7679b649edfa75ab4ab0/72531399047.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb16ee127d6---58387857514.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/c8fe04db64ba9cb342dfc7dabffa6a05/44142406163.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/40440719761.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/getumolab.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/71750239792.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/7074961569.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ab48c8541---nowew.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16096d52ae32f3---natogufu.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2431b6b2369c5bde8613b4bce99aca7d/gokukatoxafenupowi.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/gubirubegaxuxepoxonubam.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/89fd7b85de349008325f71c13fcb5cd0/59340114331.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/gemufinegarovo.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/wutenokutufopipifetejume.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/0a1da16f4eb79b72c6001d52d6d8b37b/85261944238.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/20024683401.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/747b2aae74215ec24a08e272ef3a16eb/70563248119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=financial+cost+and+management+accountingPDF 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_off0000d602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD602 15968 bytes
SHA-256: 8f65b97c7bbbd52c9e3e54a29c57295f92833de8fe2920290707f4deeb0eb516
font_01_sfnt_off0000feea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11701 10692 bytes
SHA-256: 8c72193a93045c6d6e83e3790831a0e8ec2316c12aaee9a4cda3344e2d07b574

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