Malicious PDF — malware analysis report

Static analysis result for SHA-256 116d05f8995d4f38…

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 05:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 27ef37358086b0c76be95911aac0dcea SHA-1: c5b15d083ba7daff82fb676cbf6d0d7c64c8ae1b SHA-256: 116d05f8995d4f38e2e37ed1ce58a7ca722e3e2eebb6570c38c79899fa97a1ef
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of a link farm indicates an attempt to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/menolubidepiset.pdf In PDF document text
    • https://jasz-pap.hu/UserFiles/file/10602401649.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/59c7a2361f14022a52191fde09a7a185/mefivuxelifedazusimaxefat.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160755d13b4549---lisonewamarimaditorirur.pdfIn PDF document text
    • http://riph.pl/userfiles/file/11497110534.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/kivixusosefisegejabemawim.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0a25adc2e---62717837121.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1612c6bde04632---litixuwemopil.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-6/20210506080354931986.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/xupaw.pdfIn PDF document text
    • http://ipublicity.cz/data/file/pasinolojokijo.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/76967756490.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8f5d6f712---makawudesabar.pdfIn PDF document text
    • http://feg.vn/uploads/files/mukowi.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd109d46fc---27261246025.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210813174903.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/91b1d281570ad51ced9f2c604eee7a9e/gotosetowuta.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/81921902981.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/igrroj3viqr62a5rg97b0g5l19/28890415242.pdfIn PDF document text
    • https://beliangka.com/contents//files/magotorobogoselalipozif.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/4a8ee42d4c2fb282772331b505e2058e/potivabi.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609081908fcfc---wobidefesipufun.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ffecc3a23f4---kubabiretokazufuso.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/76913586773.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd5abd7d41---vegubawazadajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=june+2014+chemistry+regents+answersPDF 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_off0000dd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD22 11172 bytes
SHA-256: 3444f4903fff9c88a813a0ff9fb5b4f9d5502bc885e397ec0ac013afb9f46316
font_01_sfnt_off0000f757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF757 17900 bytes
SHA-256: 7040bd7a196d6d46ea6e1cd36df32b1d2098eb6565b5db6a8097a9facb61b8c5
font_02_sfnt_off00012594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1