Malicious PDF — malware analysis report

Static analysis result for SHA-256 588ba6268fcc5782…

MALICIOUS

PDF

89.1 KB Created: 2021-07-08 14:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df0cc9467e475d5a575e3bd365652035 SHA-1: 0cf62c642946af363af2de18086e44efed4e8251 SHA-256: 588ba6268fcc578298346d46edaeaf63f6fce1e26531c802da54fc3fdc4bcf61
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://ajansnigde.com/resimler/files/gidalaganorebodub.pdf
    • http://atomleasing.ru/media/File/34832269787.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/51055a4e8c2d8b6736c45aa699f02672/bevivo.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/91be832d9fefa86e00994cf8882626f7/sizusafiluralavonet.pdf
    • http://omatsuri.kr/data/userfiles/files/pabanumugejidotu.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9f6ccf46d---domovedoxiwubanaz.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073675d914a9---23577813327.pdf
    • http://xpressup.com/userfiles/file/90751634007.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/fj9qmldaas7cooo5cvlluno2rp/32991901282.pdf
    • http://www.77ice.com/upload/files/8956518123.pdf
    • http://tcihk.com/userfiles/moxigilujudumadidat.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/026eb6b073baac92ae759259425db73f/21238704234.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/63dd040dc6e5435aa4d9cc85fb764236/dixevetijupigisumed.pdf
    • https://jagominum.com/contents//files/gunedudo.pdf
    • https://corpusbg.com/files/fck/file/ripibetu.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/6bb22bf2b5a8dcadee1f3d9313479208/nosojorelaxigate.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b589624600---12891138915.pdf
    • https://dusunceokulu.net/resimler/files/lewun.pdf
    • http://logiccpacma.com/ckfinder/userfiles/files/dupafugexu.pdf
    • http://ekolojikweb.net/upld/userfiles/file/28821443024.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/740cc6863056b15761d2f863af4b6719/raxogefumuw.pdf
    • http://cherriestattoo.com/ckfinder/userfiles/files/vavalazuxowigulilo.pdf
    • https://bestofbucerias.com/upload/file/kasizudepelogelipejemexif.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+calculate+enthalpy+of+neutralisation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da98.bin
e9729c486037d7f46554c863924ef0a440e7d53a6eab4fa8292141b6599a6ba9
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA98 10868 bytes
font_01_sfnt_off0000f3b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B0 16792 bytes
font_02_sfnt_off00010bc2.bin
3c47d6d70ba12dca82ad2eddf3f7231fdc4b67b11bd7e9455602fa2fcbe4c420
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC2 18580 bytes
font_03_sfnt_off00013da0.bin
d0e02ea597b059e12c640018e4c0b859d2fbe31b167f59dc9fd0dc6423c65742
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA0 16488 bytes