Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d87e105a101c85…

MALICIOUS

PDF

73.9 KB Created: 2021-09-15 09:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: badf8085a03fdadb3e4ff06a9e682fe3 SHA-1: af4614e1e9a363f1935c81669b3f9ed558a539a4 SHA-256: d4d87e105a101c85decfa322ef263ca0d61341154900a82e8a43363ce3fb56d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate an attempt to lead users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=watch+online+movie+good+news PDF link annotation
    • http://chi-kara.net/userfiles/file/xizuxat.pdfIn PDF document text
    • http://chinalabware.es/d/files/lavazupewebewanuje.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/parodigazumebegalupoduv.pdfIn PDF document text
    • https://ferropula.hr/files/dajinu.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614183ce6b642---somisapase.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/tawesowupabolajevijis.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/56893963290.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/41367791801.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/mogalokezetubev.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140da174f678---xojexifo.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/42722804315.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/nolv7vmct5f57kseikp7ak7m1o/tajizukusojubegabe.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/rekugesinavamatupu.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/kibigamogusufaxonimomit.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16132aad340d55---81485487876.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/9ucd54gc6adl1kipq1gjp9keoi/jagaputagew.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/18000119166.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/nudawan.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109140050158364.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/4281493824.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/sozajaxinizorubotas.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/98718238417.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/kotawurexob.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021090520262370554.pdfIn PDF document text
    • http://recviem.ru/img/upload/60572097558.pdfIn PDF document text
    • 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_off0000bbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D7 17268 bytes
SHA-256: 7f260144061b684d0e08d616509b8a58cec9fc36326aa8904b07f4260147015e
font_02_sfnt_off0001010e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010E 10864 bytes
SHA-256: 2228021d9956f49e2de3c007b6b02fd20741b6e4bb2e83d715e79a1ab9ba38df