Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7fbe30c4fe3a056…

MALICIOUS

PDF

72.1 KB Created: 2021-09-26 22:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 885173bbe7d416e953283ddaa2890717 SHA-1: 8b0a298cb04557521f7066773cfc158b83ba589a SHA-256: d7fbe30c4fe3a0564d2f1161330fc3cee6e5a781889b897c61f5f63ec63741f0
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://media-get.ru/userfiles/files/dajamik.pdf In PDF document text
    • http://opersan.com/file/mekubuzupofuk.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/tarogotexekalixigaraluv.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/newevisegu.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/delekixodiremega.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/36193763842.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/xasobavemewonanezimimero.pdfIn PDF document text
    • http://boki.hu/editor_up/kenurigutimoziliduv.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/genuwigiganinofubos.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/98372558929.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614034d8e968c---48490479882.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/81841507007.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/77436835297.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/47658557977.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/25cdbec44a9fd8428056bcc143818d26/vilekuvazijivaxovare.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408ed941c64---15018665968.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/5792733011.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/28886047612.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/71b85b2d683413d7cebed107f54dfdcc/nomorajeboxirigaxujiri.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/xodimuzedok.pdfIn PDF document text
    • http://grafitym.kz/files/file/mokegu.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/52190394715.pdfIn PDF document text
    • http://wedding-ideas.ru/ckfinder/userfiles/files/ribipojibe.pdfIn PDF document text
    • http://palami.by/images/file/94386678959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=synchronize+outlook+2010+calendar+with+androidPDF 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_off0000b33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB51 11120 bytes
SHA-256: 44b705084c78c6e09cb4ed3f4818c45d28bdef9fe08404553bae197ab7208a6f
font_02_sfnt_off0000e563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE563 17440 bytes
SHA-256: b3d1ed28b73f41b0093299cef78180f34c26d44a4fff3a322c4ba5ad6caaf658

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