Malicious PDF — malware analysis report

Static analysis result for SHA-256 763779656c4766b7…

MALICIOUS

PDF

72.8 KB Created: 2021-10-06 02:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ea1a59cb4ddd498f29b1871c2b81604c SHA-1: 35f861fe1e0539b2d834ef2c5d4a7e0c0e0eec68 SHA-256: 763779656c4766b7c4f0d1c839e0fae7115b73075e6ed9dbdd76ec75c8aa5f7d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to phishing sites or download further malicious content.

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 http://cgpreceptor.com/ckfinder/userfiles/files/lafolaruwujivexudoxi.pdf In PDF document text
    • http://elsped.hu/files/file/99870716749.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/rivepigebozexozuxaxat.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/20626672309.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/ludiz.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16150c04e3612e---ligonevirikasane.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ef26c97a83897cb6612537dad70fe629/31656108500.pdfIn PDF document text
    • http://www.miwon.vn/app/webroot/uploads/files/36671387196.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/16607487351.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c0ad0c0fdc---29090216428.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/35142611369.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/54011753432.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/kipubitufeviwev.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/mijudujinabawopodata.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/melebaxalizetezobov.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/84395182679.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202110010826415773.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161359cf6c2d83---nejananisuduros.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/xaridodejoxuzizegufunozik.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/nogutizuviravewasorenefi.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210918_142009.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/vokekutakijunigimu.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/98279531212.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/vegofimusisaxes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+trim+your+own+beard+with+scissorsPDF 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_off0000bb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2D 16120 bytes
SHA-256: 9b0707b1879b34d1cadd3855bc108d40db5bb2abf83900b9d01e45ce64932aed
font_01_sfnt_off0000e421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC38 11020 bytes
SHA-256: 2d522f3a466ffc694ff018e05a171ffa9bb99ada87d139bcb03b8255201da1cd

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