Malicious PDF — malware analysis report

Static analysis result for SHA-256 49e606b813acfc24…

MALICIOUS

PDF

83.5 KB Created: 2021-07-10 03:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79ecc7178ebf97f3a0f5c7d520450dd6 SHA-1: 37297199d20f91d9479b6114de37ba62adc15da0 SHA-256: 49e606b813acfc2468550aaf3c4029eab4689052a267c95d36ea2967bd7f2521
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading further malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to host malicious links on potentially compromised infrastructure. No scripts were extracted, but the overall structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/44435034472.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab01ffebeba---letuduzokubuv.pdf
    • https://panificioilcavaliere.it/userfiles/files/zanutakeserex.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b64c415f202---74835321343.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160711405363a4---68144628537.pdf
    • https://sofanet.ro/ckfinder/userfiles/files/sosugasaponupojog.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/faf278fa868bdb6f51e153df6821a66f/pezekope.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/aa0b84f8c8bee6a90399ab870673c5ed/11349544368.pdf
    • http://ok-poland.com/userfiles/file/vutedosebifi.pdf
    • http://tragiaocolamsapa.com/userfiles/image/file/lakebediwogunafumules.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79bbb75c4---79206414472.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/agbe9tf9mkk1u2knjpspd3t4s3/tuneroduxigazomanesetaton.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ba96d9005---diguwenope.pdf
    • http://www.impactit.in/ckfinder/userfiles/files/taxizevenolosukurivoleg.pdf
    • http://circuitvietnamcambodge.com/hinhanh/file/42358471827.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/7d1821d76d71a66907bb642255a7678a/27287326015.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/257d99a2af3fb5b14b096c49631acfda/jozojizudukevepaf.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/3348ddf5babeb466d22d047bc6cfbdb0/96319587841.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ec5a3fba1---bebadifatomokagag.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/6f60d16abcf740f4aca71f831758f062/56269469190.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/9392f7027b736311b824ba1c42639c0f/zujodupagozimema.pdf
    • http://puppiesjust4u.com/clients/c/c8/c8a8d0e690f73854b1e7a5fbb9521f82/File/52675079236.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/rujaridipipivewoj.pdf
    • http://arlingtonhigh1960.com/clients/881088/File/xelibur.pdf
    • https://buka.ru/sadm_files/57908003176.pdf
    • http://93564497.com/userfiles/75635073035.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=eviction+letter+example
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e521.bin
7749ee24d61da689993d6849dceb4d42ce6bbafc3c118ad1dec36b79ec3f9717
pdf-font-stream PDF embedded font (sfnt) at offset 0xE521 16776 bytes
font_01_sfnt_off000110f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x110F2 16792 bytes
font_02_sfnt_off00012909.bin
d35e3eb7773b8a5678a1b59784827e233b451ea1d270a7882aba973265c0bcaf
pdf-font-stream PDF embedded font (sfnt) at offset 0x12909 10520 bytes