Malicious PDF — malware analysis report

Static analysis result for SHA-256 381ce86f961bbb08…

MALICIOUS

PDF

93.5 KB Created: 2021-08-26 02:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 04d04d638beda26b0f1d1c519061c0a2 SHA-1: 6e740d4e19b3947cc3ff50bd591b001472418558 SHA-256: 381ce86f961bbb08b330e46793991518871a20a3700768d50ae4f10383ff1c36
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9048fd400e---mizozax.pdf In PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac59eec8fbf---pajutojewibapeposutu.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/44392060174.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/09f68158fe1832fed1f32f58a39c4074/9799510571.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834a6d0f103---9524332059.pdfIn PDF document text
    • http://rurisnet.org/images/file/zilomidopoxikomozubeze.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/3617418418.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/14602717911.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/sofitabexozaxe.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/bemirazetux.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/tidokokaliwoxakazezigad.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4db67d9a2---97529114570.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/43174fb19d14d5e5f59170b93aa9b69b/minewupekujoruwe.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/lejejofuraliburagiwifu.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec6cb9d096---74364221711.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/mibuvafogi.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/4822439016d1c0be599ffa68b94f8654/47799647399.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/93944516130.pdfIn PDF document text
    • http://yulintimber.cn/d/files/xatogopixeninulelajude.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/94996253842.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/2c376328292787d37ac03d15c52ff2af/99455016795.pdfIn PDF document text
    • https://viticoltura-enologia.com/file/tidavokipegivajaguru.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/9870445462.pdfIn PDF document text
    • http://aroma--style.net/files/files/madurebe.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16090528a171f1---rosifiwufojizitanono.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/zitofotode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=highest+non+commissioned+rankPDF 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_off00010923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10923 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12135 17572 bytes
SHA-256: e2cdbd98b26c4dfcd621f83d09d564556df2a05cae0b8883bd7c47eca7182801
font_02_sfnt_off00014f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F02 10852 bytes
SHA-256: 7d2d4e1795a88a06bc60ac28f8b0a4b89f0ca15701eca9663ade5e33420c6ff4