Malicious PDF — malware analysis report

Static analysis result for SHA-256 02c0fdf61b2838e2…

MALICIOUS

PDF

91.4 KB Created: 2021-07-29 23:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d172625313c2e5d7ee6e2a3b77ab9b71 SHA-1: 85a11b142a5429aa516f31a0d06e8beb2fa36c2e SHA-256: 02c0fdf61b2838e2e328ef1f00a4cfc246c45cda7446e8c8a4bbf01a2586f18e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/18l1m6mbumpid3u5mkcl0paop0/nebakagizasagefufijowef.pdf In PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4da49e23f---41375904595.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/vesudu.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16098881781cc8---tiwozafef.pdfIn PDF document text
    • http://richwoods1969.com/clients/861079/File/24416669952.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/zaxuzigunutobuvagigifa.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/33832465293.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/14198412431.pdfIn PDF document text
    • http://lungtransplantopen.com/clients/d/de/de7cc03d42bda6b8b84c8ac9728529bb/File/ruxavetel.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c14ead36177---fivudikisudovumifabotuxun.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/7794705656.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/5644e4fdafe3fe51998cebe2fd8b36f7/mulumuwoxotuvezetizeg.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/44tkrsiegia4re6qaov69j9fe4/witomokego.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/ebe1d9ece2495d49e495aa0cfe09358e/soderuz.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/vogebosos.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae5b4ef08---75091031062.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/31969833084.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/95232627792.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/726a3e10dfb36069adc74bd28a0aa633/sepuviganemutu.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/d389d8970980379eff44ad37aee10e03/5011931188.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/9g0atavqff5auv93a4bef53tt5/basomosu.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/kegon.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/muwokamurelemonote.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/vizinurevu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/347424df03606dd0c38653bc2d46581b/65605593121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=diary+of+a+wimpy+kid+the+long+haul+movie+summaryPDF 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_off0000ff7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7B 11404 bytes
SHA-256: 17289465e5199cab0b2b9dd1ddbf57c6b4109bed3da404fe7c7eb7688af94af6
font_01_sfnt_off00011a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13226 17324 bytes
SHA-256: 1c6bb5bc8c41d7265573820afe64ac84333dcc6fe3582fc319c306cf964ad179

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