Malicious PDF — malware analysis report

Static analysis result for SHA-256 704f025827b0419d…

MALICIOUS

PDF

89.0 KB Created: 2021-09-17 04:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8a26e2b61672e7c4dae5717833e265d1 SHA-1: 8e21b549637ee80e6a59a54871b1e60d3d9f2186 SHA-256: 704f025827b0419d589664c0d42336a104fb4493ad34654c49ae3eaf8e1c0f57
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, 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 or disposable domains. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://blueview.nl/app/webroot/files/userfiles/files/11519388258.pdf In PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9d89d5253---tegumuzixorufajiwi.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/28244554381.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/molowiwawilegimi.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/64495293167.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/3335587044.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/resojejifepoxadexitu.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/gobupabejeliropozijuteta.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/13677799742.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/7da5bd75df2afa98f560f2f89cfd5048/bukebupuvexogegosugebitow.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/83070285734.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/tumirasomeri.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/18045020439.pdfIn PDF document text
    • http://rsst77.ru/upload/files/lidok.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/30974046686.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/jazexofixadilonaxeb.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/lituxosudafe.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/nizurugefobiworijokepad.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/24855655643.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/2usii6udgp87t8pj7mekk955sq/kagiwinizeg.pdfIn PDF document text
    • http://scpt.it/userfiles/files/65807560019.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/zavozokov.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/wofuxufilixutudaran.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=flyer+maker+app+for+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_off0000f93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93F 10576 bytes
SHA-256: 536d32a89e03e70e10ea94ca2622e7bcd00db17e69d0607e2e22d88cbcd43e8f
font_01_sfnt_off00011143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11143 17284 bytes
SHA-256: 6b7bb624be9427d3dbfc87d3d65c5011fc9d980f743ecfda3027abaa7e25f84a
font_02_sfnt_off00013e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1