Malicious PDF — malware analysis report

Static analysis result for SHA-256 4010c7d5b2c133f9…

MALICIOUS

PDF

83.7 KB Created: 2021-09-05 08:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a7ba61f9b17909922405f00506fb2db7 SHA-1: 901ab799faacf8544c0e894509118f843e2c994f SHA-256: 4010c7d5b2c133f96c7f5c8adeada8355650745dab6e7ed6829a25e10167a0df
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a potential distribution point for malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links. The file's structure and URL patterns are consistent with a link farm used to obscure the ultimate destination or to host secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/miloruwalogo.pdf In PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5e63d6dfe---tilolozukegasuvexor.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/tekegufugidevufeva.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/pokinegaluwipegujuno.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/02e4d97736c24463ec7f808ea9cc9457/zajiroruro.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611d51bb5d594---808591487.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c19cbcccc86---vonuzipafozuvav.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8ac408f35---79067248179.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/65rnsfpiehpg1s4jk9ceu1hetq/31684079161.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/40844954416.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ed21a19b1---58450993950.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/xubabarebaxofotob.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/38924068375.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/71210865942.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/96010734757.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/padunabafugixozalidufag.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/27888287851.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ca079facc---87349530168.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/5546ffddbd238f96615ee0e9e4368525/lodijurulededimuz.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/71398142204.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a49c020be98---wurukamolo.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/vejenarivamilowibawigeje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=manometer+problems+fluid+mechanics+pdfPDF 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_off0000e202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE202 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA14 17632 bytes
SHA-256: a758d0a16c4f7475d300e851da951488562c71409bd99a783c21981f5eefe80e
font_02_sfnt_off00012782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12782 11120 bytes
SHA-256: 5149134290e8c30bb490c98a51b1f7bedb8326dd2973e59e4a4a9bc3582c5ae0

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