Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5fa502b41e344b…

MALICIOUS

PDF

76.2 KB Created: 2021-07-12 23:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08956260221fa546dbc2ce9ecdae9e0b SHA-1: c78ff99ac1217374f808384d7790816f21739056 SHA-256: 8c5fa502b41e344bd2995d5fa0bda22a61ddf22787d6ba64c342d64d9eb3159f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://sva-jeanroze.com/xmedia/file/94244784149.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5f2e77279d---89046805166.pdf
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/tamazakofazupexoba.pdf
    • http://onlineexpert.in/userfiles/file/xosob.pdf
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/03fcd1499bf5edb47a4f15d6d1c2a63b/lifebizetefuginuzebaki.pdf
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/619v27c0lfd6p2tlggv89jshvk/rerikavulazevenu.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/2d2ddd69f340a344f9a9b8608b035830/tazuviguwoda.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/5e500ce0e220edcf9503656f03f4b3ab/govedogijetunarixigevixo.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b78897810---25950383335.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/457fac839b53de4b03f63dee3f8d7140/20303534238.pdf
    • http://goksirkrupskimlyn.pl/img/upload/files/gulijiromilox.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b0e337d48---vozupuxuxape.pdf
    • http://faw-asia.com/image/upload/files/3727398374.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072aedc87c61---kutovefuvimabogagelim.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b724c576c3c---jijuselurofozeru.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/90defb4c252b27c3479695c46e9edd20/25890116772.pdf
    • https://taipeitccia.org/CKEdit/upload/files/58891141865.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/jajixigodibuja.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b67cc399dd---mimireditiguv.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/jvnqq7v5egns87esblf7skjfgf/gatesaratunixikipasin.pdf
    • http://suvagcentr.ru/userfiles/files/55854080044.pdf
    • https://arte-salon.ru/upload_picture/ledomowabigebopiv.pdf
    • http://rjbmachinery.com/d/files/58411834633.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ko6r163r2gu91q2sacecsd2jn5/86081705737.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=describe+the+features+of+democracy
    • 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_off0000ca39.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA39 16792 bytes
font_01_sfnt_off0000e250.bin
50daf8545f49a47446fc0108c4b1bfd1660023facb0071b45c681a104e0b1c09
pdf-font-stream PDF embedded font (sfnt) at offset 0xE250 10948 bytes
font_02_sfnt_off0000fbc4.bin
42eb96f96e6d1f85e1f7fc8b960fe7f3f7d9b2d851a02055f4e21d5ffa4995bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC4 15476 bytes