Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfccc1592befc4e1…

MALICIOUS

PDF

85.8 KB Created: 2021-06-26 15:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5a4ebe02fb9c51e626b66eea7818e0a SHA-1: 1b053414c6dd46622a95fced67ba5ea40ad652d3 SHA-256: dfccc1592befc4e17984dcbb382c71a815ee0be18adf1a2f48b1caf4c0dc3309
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable domains, suggesting it functions as a link farm. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://bititechnika.com/uploads/file/jixejidinabewokixojoxo.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/a5b6a9f6a63293bfdff5d0316ae05b41/17538129978.pdf
    • https://cihangirhotel.com/upload/ckfinder/files/80156794878.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/7fb7b05783d49458967de04f72e63641/lotekupegarotawe.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c84476f995---savozososodizajijerifi.pdf
    • http://vyveva.eu/UserFiles/File/238729764.pdf
    • http://harchovyk.com/userfiles/file/29045283996.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1f31165c---71002486774.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160773999c28b6---9749255157.pdf
    • http://gianniarnaudo.com/userfiles/files/tizek.pdf
    • http://amirafouad.com/uploaded_files/file/61189965612.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/5de9aff303aba63897e7f3f2a0ce1804/wewabudavuvazojizojifo.pdf
    • http://leaguengn.com/userfiles/file///wanawovutobu.pdf
    • http://lavalnerina.it/userfiles/file/banolade.pdf
    • http://cecev.com/stockages/files/jimisifalujilutulogoku.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/h2sdbcq88barrt6au2ses1a0vq/furuxazunaxepakere.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cee5f5b3c13---zugasikiledemibig.pdf
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/36542971253.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f84a9d570---fofubagofuremaxulidoxoga.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087f1d2e3491---zuxuf.pdf
    • https://maisonforville.be/documents/file/vaxodabijetapevezonesemag.pdf
    • https://rybczewice.pl/userfiles/file/tivofurugopafikugolaja.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=let%27s+go+2+4th+edition+teacher%27s+book+pdf+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc03.bin
2cc8971331a11097ae08dbcf4f082cd3bb6e8af1bf5329326fdbeadb6d45c940
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC03 22460 bytes
font_01_sfnt_off0001146f.bin
a7e60a746a7cf437e720c4c84d68228ff87984336b269a4992299b87e856ed15
pdf-font-stream PDF embedded font (sfnt) at offset 0x1146F 11408 bytes
font_02_sfnt_off00012f18.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F18 16792 bytes