Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d9d34d0f8d5bb32…

MALICIOUS

PDF

89.6 KB Created: 2021-09-01 00:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 901b10fae689f390d05ed3b5548fe49b SHA-1: 2aa56dcd286748a060c5a5a211804c3965cfc2c5 SHA-256: 9d9d34d0f8d5bb32daa334c243b5b4969a9b1c889d6548a2d64030841e641d03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple disposable hosting domains, suggesting an attempt to redirect users to malicious or phishing content. While no scripts were explicitly extracted, the presence of numerous external URIs and the overall heuristic profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f68384deea---37589877401.pdf In PDF document text
    • http://sziazsauto.com/uploads/files/wefimifugunoba.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/senitomebazoguxar.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/lgf7ajhldv3bt2pen2a4bl5gn2/29844304265.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/20093165877.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/d797ea4f4128971511e8edb45cedee34/67739045895.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/86285650742.pdfIn PDF document text
    • http://grimastone.ru/files/88692443003.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/67864841402.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/l8impcpoc02i72fnqjqp3bl3vu/duwadivakiwefexuxolux.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1610c824e82350---21031722289.pdfIn PDF document text
    • https://energooptima.hu/upload/File/13809450551.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/4056259789.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ff0bd693a---56635221168.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/sevodoxorukamasaxexemu.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/7ca0d0f0b05663c8608ba0b585be1ab8/pevawes.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/0615f95d7404f962d30f9080e549e374/fupojow.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/woxoza.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210820_441B67A299494F38.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/nuxamokiwelavased.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/buzujalusafo.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160b53c1841cf3---dimamima.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/42271839443.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/wiresalewupolitilarilu.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/dumeretaw.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/41cde2303730482a0cbea5814ffbf245/49410329141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=definition+of+like+fractionsPDF 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_off0000f79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAF 18640 bytes
SHA-256: e19e60c402195589346d12a6abe473d32d4cc1c2bb9ce2494a003f86f3597ab4
font_02_sfnt_off00014002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14002 10420 bytes
SHA-256: 0a0c4dea761cdd1961d6f5470559ad798b0698c517640ca51781eaf0fba109f2

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