Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ce452124f069da…

MALICIOUS

PDF

103.6 KB Created: 2021-06-27 10:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0e78fdc25d5a135fa783fda9e704bd63 SHA-1: fbe7949d3012785ff9122f080b76e3dfc13a288d SHA-256: 19ce452124f069da05ff65ef8c99b5dc8c79b528cec56514fd351ddf1a36b3cc
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, likely intended to lure users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of numerous links on compromised CMS upload storage reinforces the phishing and redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9685

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://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16075b909ae044---7452669025.pdf In PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/6e50f2a008c49ae6a354318623ad815a/21561460334.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608084092f7b8---66597260931.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021062300554473499.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/lifikugizotitototud.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9b75db667---12010214417.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210626091400_1852202235.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773777dfe79---57401102133.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/0d1167aa62c37a3cd691fd09972780da/90396147883.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87e0063a38---velipalafelatodigomeb.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/baeaec85514d7d6d4def298bf79e8793/10203992067.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/1d00da43b428e2a9ed0769363f4fc7e6/revajuzat.pdfIn PDF document text
    • http://nfc.soo.jp/file/11121192028.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/79012326580.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/627334a29547ce7c442cee4b11a0b337/20230126554.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/bc1c2390e0774d0e229625bb3dc22f7e/nibofaradatonupanu.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/maviviwopugosanob.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/tenilamoribanerag.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/99aff0f44135f07a8a3be81fb274dee2/resamekug.pdfIn PDF document text
    • http://juha.be/_files/file/21154560068.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/9298237925.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/m4f48765pnclgck8jauclo5blh/66903158588.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/26120587603.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/71cb6b0d89212f0cf7b1d2c0844e5960/47115202981.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5af234b6f9---pimowukiribelol.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a2860b99803370a84777dfc827f3f6e1/77692587914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+add+mods+to+stardew+valleyPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37849f0d30---70559946982.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13351 17392 bytes
SHA-256: 974e6c682cd2a16446fa48b3c17069a82c3c12976412a34445b489492e571bec
font_02_sfnt_off000160e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160E6 16220 bytes
SHA-256: 12763a58e416dcf4a521e9aa5e00966ab11ad00515f86f39e4ec59ec2f202c66
font_03_sfnt_off000176a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176A2 10468 bytes
SHA-256: 8ecbfefafc1830d5979428fc3323b9148f63a877e7b860795c6873fc716bd478

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