Malicious PDF — malware analysis report

Static analysis result for SHA-256 2063876dd0b6d49f…

MALICIOUS

PDF

88.1 KB Created: 2021-09-23 08:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 909cc31c28ee3b389605620be0461942 SHA-1: 61e9e6adfec95df8a800d22e6532ee098894282d SHA-256: 2063876dd0b6d49fa5959672c8272bb2fb6b3f7c23099013e4285f62bac748fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. The document body is heavily obfuscated, but the overall structure and heuristics point towards a phishing or malware distribution scheme.

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 http://globalbizkorea.com/userData/board/file/vagamisojo.pdf In PDF document text
    • http://alt-1c.ru/userfiles/file/zaregebekodexesek.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/gotipekelosug.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/28225129508.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/82948110473.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/80432902914.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130b209e24e5---solekujoxomeza.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/91739759598.pdfIn PDF document text
    • http://gdgom.com/upload/file/2109230748130243881arlydm96rvk.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/25385444520.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210906194802.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133c0b87a0f4---sakosod.pdfIn PDF document text
    • http://maxbrio.kr/files/files/85047206871.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/39457354841.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/pajagexiposukanajar.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132c77194f14---toxejuduboxusog.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b28df190b7---zosojaligenolupekugobuxaf.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/18652161487.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021091419072173.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/27822840188.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/74673668000.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/33139899188.pdfIn PDF document text
    • http://ukrfirework.com/images/file/vajusavikapowikadir.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/i6n3pp14ucbh6v28j0h2geco0d/32066619490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=bhagavad+gita+chapter+9+telugu+pdfPDF 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_off0000e82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82E 20920 bytes
SHA-256: 981dda6fb180885a73149c349b45add9602c77572b4974158e0b518ae385dcf4
font_01_sfnt_off00011f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13757 10896 bytes
SHA-256: e4f1869cbbeaa8a9c80b062143e2320297adc9092b6b9f6b3c8eae069c0c8a03

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