Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ad5015c842a680…

MALICIOUS

PDF

86.5 KB Created: 2021-07-14 00:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 10371e373f19e24728de78e6236020d2 SHA-1: 93a4700a9f329f52ac73d73864413106ef4046ea SHA-256: 99ad5015c842a680d65ec8a1950f52a9763974f80e9659b223261889829dc041
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites, likely to host or distribute further malicious content. The presence of a 'Download' button heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/38d8663ea7dc49e309240ea584e90cdf/81293266013.pdf In PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/d9b5c8108f9959c873c46bc105031a2f/fovajivorepifuvus.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb566f89b30---gorinebubexokojux.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/48120976632.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160881ca4f1894---xoluzitabubuxusemopu.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/3b6cc42c3d522631edaf1331c43c9eaf/vavinuvarexusixude.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160782df4dd862---25822320161.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/24869027515.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/vanupemud.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/92014504518.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/nuterujibovuvezobugo.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/44c519530b7de6ffcfcd9ee4c98b400f/79297817318.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/sumiwuxubefufujivale.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/fogododedakotesoja.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/biserogoxojob.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/46225119317.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/d7548550c52438928412248e87c150db/galawisomog.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/jenepunivobedonituwa.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/adbba84bbe57a79869d2b4de7b44d26d/bunajedeporabawak.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/sejusowuseluvudogu.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/dodilarabilofur.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/ri9b1rngspmr1manc6v98vnp10/buladinawaporonomakivum.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6f9308ef9---lanirule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=20+practice+routines+for+classical+guitarPDF 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_off0000efb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB7 16948 bytes
SHA-256: 1a42bcc0acd8ca25c2b6ad6211a02eb1f6fc8d64d9da31e82f7c0105e17403ab
font_01_sfnt_off00011b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001335f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335F 10900 bytes
SHA-256: 2abc43cbc68099b998dda2c58e5f48f184a9054799ff65123ec71ab82071db4b