Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce258745892aef2…

MALICIOUS

PDF

76.1 KB Created: 2021-09-17 00:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 78dbf997a6b8f493976a6281c1b9d72d SHA-1: 63c290b9d847cae75d40ac49949ad9820b99975f SHA-256: bce258745892aef2a77c7680a99109a2e1e918d7d215882fa8e77abdee3a79ca
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://photojet.net/userfiles/file/petedazoxirupunaf.pdf In PDF document text
    • http://seatraderhk.com/userfiles/16422704759.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/besuxafufopifebozul.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/kinoluvosizakovexinesape.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/77553182294.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e419e7ef7f---kasoxipagojuxalu.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/wapetudalowesiwaveguzefal.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402683a2f32---39835614276.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/9313859493.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/73086243145.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/dujuwaxipanawenoviwonuxos.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/desifiv.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/10034130153.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/15482891158.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/sakedepovogovijara.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/95867977301.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/mafafofa.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaee62ae45---79734089542.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/kogirumetijazopiguwebi.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/koderamewenaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=download+running+to+you+by+chike+ft+simiPDF 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_off0000c2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE9 17448 bytes
SHA-256: ce5cb895a3b7ca466396b04968fd240bde928dfce74651b0d298b055125e42f7
font_02_sfnt_off000107b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B4 11456 bytes
SHA-256: de7485a50266ef14ecb7a0785e8711d59d482f0d3b60d7e0cf4646dfef16e988