Malicious PDF — malware analysis report

Static analysis result for SHA-256 278a01857ec5f36d…

MALICIOUS

PDF

81.5 KB Created: 2021-09-11 14:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2009ba321a15e7721de581ab4fd209ca SHA-1: c0091c5095d3c3e8b934390c65e3d4620c17b3d9 SHA-256: 278a01857ec5f36da75979134e7d7328f800189aa0eb235f9838798c719b8c49
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites that appear to be part of a link farm, with some hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The `utm_term` parameter in one URL suggests a lure for downloading software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://thefarmatarapahoecounty.com/userimages/dosigepibazifivutodasuv.pdf In PDF document text
    • http://autoservizimensi.it/images/fck/file/89703916622.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/57496400191.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/79181787891.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/53910298479.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/63192352542.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/81931105392.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8b614ab98---gemujamavonope.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/73702735485.pdfIn PDF document text
    • http://showdoimovel.com/files/files/givotar.pdfIn PDF document text
    • https://electroagro.es/pub/files/39170772576.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/99815474533.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7a2b14b92---88981463345.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/winuguvutomemuzog.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/95807752046.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/minebuxopajajibosofezu.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/loxenotagelapixe.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/loxufapepegag.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/77468328864.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/nikarotowe.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/22051862606.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/06035f970553eb886e9e4b9761c4f7e2/sojadatudonapexekiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=android+x86+installer+for+windowsPDF 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_off0000d96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96B 10892 bytes
SHA-256: 7b9785bda8a87286f386fc84e86aae634e9636a89ce176093a695ef3e66b7889
font_01_sfnt_off0000f2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D7 17468 bytes
SHA-256: 977cc745cfe76eac370d666701f48c08d79bdf543464557156c3f2416678f0bf
font_02_sfnt_off0001205c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1