Malicious PDF — malware analysis report

Static analysis result for SHA-256 0758e5686610dad1…

MALICIOUS

PDF

85.2 KB Created: 2021-07-07 03:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 463657e8d9cf2d14d6932de4381986c7 SHA-1: 08e0d9c67aa70c8177d779fee8a37b7ef4baaa2b SHA-256: 0758e5686610dad1d3a5a45edb4197316c12d9a4ae8adb84298ff89ec4a36aa8
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The document body is unreadable, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/baxipepafivoz.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/7l3u2dkbbteolt98g1s8mr3mr9/12543837001.pdf
    • http://ash-graphy.com/userfiles/file/xadopupufofojixoriwobofi.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea7714388a---jedokufumi.pdf
    • http://kingalbertltd.com/uploadedfiles/file/foxuf.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861206a2b18---75776742234.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c62cc6ca8a6---48096586117.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/a2764bca49c7447af979133bf08fc970/nokisepomezezogom.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-2/20210502152511946286.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080aec810ce9---fuwoxizexosepaguwubedox.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/37f7c74e8aa1bef38c4087cce5db9117/76922878956.pdf
    • http://landia-print.com/pdir/file/77044992562.pdf
    • http://slp70.com/clients/873855/File/47600888796.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/d6ba67d8f8e3bd7e2001c56c52de21da/9864564380.pdf
    • http://curry-box-deluxe.de/userfiles/file/987236049.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d99b0e3291e---59653300170.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c67ac0242e7---93407685312.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ea7f97cda---45947840588.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16092b106f0080---50885125463.pdf
    • https://binarbaid.com/public_html/userfiles/file/fatug.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1ccf952e5092e9dbf93ec514cfb56fda/morajol.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/4kd6vc7jljbea8bcjdcml32cls/wenodabezibilalubumunafol.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/lhvgbgs20uqksbpomil546ih1k/47991372681.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=some+synthetic+fibres
    • 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_off0000ea32.bin
376c6bd86c762f4de21246c17b0eaef7bba3489b846ea997603f089ed6c87082
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA32 10724 bytes
font_01_sfnt_off0001029a.bin
b499a2c7e29aa0192fef8bbb517d2371bf2c21f38cbe71880fa5f1b1aa050af3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1029A 17304 bytes
font_02_sfnt_off00012fe6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE6 16792 bytes