Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8f574b1e9e622c…

MALICIOUS

PDF

187.4 KB Created: 2021-07-02 07:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc03749f20e9e0c09f6352464bbc18db SHA-1: e41b3ebac009d203d1705984096f2ea6eabb734c SHA-256: dc8f574b1e9e622c41a058a9153af6754fc44630b0f6c479c2b93e03999394d3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. The document body is heavily obfuscated and does not provide direct user-facing content, but the heuristic firings clearly identify the link farm and compromised host pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072aef45b9c7---lenoleweterisosanuw.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/eb4h0gvrnkhe8dnjmiovrfg2k1/55145762410.pdf
    • http://nadiadsa.org/userfiles/file/panenejajufekadukonat.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/906c7df8761c82ce829b8338a2cdb78c/77994161857.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/2b18a95a2a5c2b24016b7514fefed29e/69802402804.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794eedbf2d0---53256288121.pdf
    • https://angkortaxiservice.com/userfiles/file/89126095696.pdf
    • http://wecans.net/_UploadFile/Images/file/3871213993.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/ec61294e9eab8c99390f57cf17e01ea7/pobelivuzivulozuxo.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b369822475c---9539250985.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c53a59938---3998174169.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160867d7bcb4c8---8673955766.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/234eb2b541195e004129d3cdc1f7ec15/88639519038.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/07b459a46a013c9a6223ce6feb88093f/11505943761.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/2ce22be6dc2ecdd335b20b3d716561d2/numelulu.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6821819c56---94328388633.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gcq624d5371seolq5f79r7kq43/68110705128.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083aa6b77924---tezulozazuxudodolijanox.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608140ed86cfb---zenujetasupu.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d0da257b7---47933884532.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=anime+with+sailor+uniforms
    • 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_off00021b9a.bin
021ade949a40e4a9e64b1c670b611329bb9101c56a91a8e88eac90fc33ee13d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x21B9A 19584 bytes
font_01_sfnt_off00024df9.bin
6952b1fe12070d303edb930a7b1204d2e2d58190d10db380d1b55acbff3142d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x24DF9 10644 bytes
font_02_sfnt_off00026639.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x26639 16792 bytes
font_03_sfnt_off00027e47.bin
02f8fe40d49c301ceb91826ff904f3e4daf6af5ad69afb632562accf4231d29f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x27E47 33864 bytes

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