Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e2d3da9e5019085…

MALICIOUS

PDF

85.7 KB Created: 2021-07-13 22:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6c64180d4014f29b1e4dd9a3c12e3ae4 SHA-1: c4d4c39a9ab3b0321e63d2ce0d75e72a94b92a4c SHA-256: 6e2d3da9e501908550b2c7739d1c2c8641f9ca30b8d1688d0abab3b894a1dfa4
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and heuristic firings suggest the primary goal is to redirect users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://dzstock.com/Upfiles/file/vakobiwonenirorar.pdf In PDF document text
    • https://bursac.net/userfiles/file/luwadowosepezegiralado.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e2fbb32e5---sovopowejisapukaw.pdfIn PDF document text
    • https://maisonforville.be/documents/file/pewavanoz.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/9ad6b3e60db2bdbd8bd6f769179285a8/58710215273.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/t7o4rivu6qff59umpoc5emchq7/menojakezojujo.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/8fef36e2bd8f7fce67e4d746552f0c10/64987064297.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/e6a9f5d475accf747a57b0e04bf29389/14169483995.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/31791639070.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/galasuvizare.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/razalov.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/c387594a67e07cc479245400a3b5b5fe/98177366482.pdfIn PDF document text
    • https://koratspring.com/upload/file/2513596585.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16076a2c4a84b9---muvejixixamuzipamejufis.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/56059609822.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f7b1a22663e520dac5849c276a9e2777/83440839894.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/11410802553.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/3182583248.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160969e20df4bf---13593868519.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/39737054593.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606eedfde0a2b---ramirekabidarajegagudix.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/l9jf6ga7hf54a05gqo9600o0s7/78955899684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=all+trig+rulesPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/96e6ac21c9e47b70e5903cd213625b45/86709434308.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_off0000eb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001037b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037B 9976 bytes
SHA-256: 8bdc9d059c0b8f67f7cd62bf9eb7b604e37cec1258dfd3d28be0ffc50288433f
font_02_sfnt_off000119b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B6 18192 bytes
SHA-256: aa7e1aa81a71f67c3e2b26184f5d4264a34b5743e6cca7919ce510665a3e6036

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