Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd57fc709a581b84…

MALICIOUS

PDF

103.8 KB Created: 2021-07-08 07:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 82d21f2d21fc086bec5bdc1752332ea7 SHA-1: ea12be3636308e121c2fd76e96c5b5ed545b6855 SHA-256: fd57fc709a581b8462cb5e00af50d35b456c52f7656f3e5664819e9d7c2a271f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to redirect users to malicious content. The presence of multiple URLs hosted on potentially compromised WordPress sites indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/q45j6bt8j6eq8bf9ejvsei5p6j/1201582559.pdf In PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b578b9271---36218312612.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609470f1e3714---zabexaradokubum.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/9dd55b33df1c60f35dee7d5909f15c81/3060788609.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/d72c0e130fc39602766983289cb29d59/xupopakepamusivurazumobud.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/jamememet.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f96aeaa389---gagapisufawakumamegi.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160d0957f4a186---4685344004.pdfIn PDF document text
    • http://olympusflights.com/files/files/59124337365.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/95604270160.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087239f41cd1---33466647845.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/adf6b6630d275480962454eb79e09aa0/1033277281.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/ff8b04da4cf46561b51fc28fe39bd296/vororakalisedawesiw.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085aecdb2a3e---kizovobije.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/voviv.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081893ae81bb---31369410096.pdfIn PDF document text
    • http://odmooregolf.com/clients/e/e7/e7046aca88cfcc92de0be8f3f6b3de3d/File/pekezoxamonezuwul.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/sutuwupavusojivagir.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/18061235670.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/90bcdb519c55259163cf6e26e092a70e/90543974598.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/libugojazolix.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/56232785054.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/tirudozos.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/1c22af6e8e1b4175b36f836274a4942f/makaredalilawup.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/458c02fa9583df9a21ceb2208904b514/tideloxude.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8bdc0345f---8939303331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=growing+blue+spruce+in+containersPDF 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_off000133ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AC 17072 bytes
SHA-256: 8b23d47575ff14205f53c7409e0716936c7a52f0d27c831cf6bb533de0f7447d
font_01_sfnt_off00016029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16029 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17840 10916 bytes
SHA-256: 4bbe3cd3faf85aa92bfd2bb6d584cfecd23b9e7877b4bcfda0f1f8233a8cee3e