Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcdfdb81013956b5…

MALICIOUS

PDF

85.7 KB Created: 2021-06-25 19:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec8dc2ebaae5386200bab92c6d40ce19 SHA-1: f1b0d0a6256994f6f97b0d6f4ca079bd47f0f383 SHA-256: dcdfdb81013956b5cd964eae2ac180023006c8851e1dafab93dd32ffb302b0c5
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute further malicious content. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a71eb27559e---fiwapivuzatilajom.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/71ac34c5c7d70d065577f6c09d23fc00/regawasalejuvidiwit.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/b4bb9b01dbd448d8acef74efefc94ba5/poxelidufitetetadudil.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4148981bce---venalizilituxinuma.pdf
    • http://finatwork.com/userfiles/file/xadowezibatazoke.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed6c9a595f---32994061413.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9fcfd8a97---84404105692.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/ddb5112874c4f68807471311360610f5/43567900916.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3c45d00a2---31388949801.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b612c505834---25659662780.pdf
    • https://webvitamin.vn/app/webroot/uploads/files/kewofajid.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094b158e609e---65349805586.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/a40217cbc48a76be5e0f3c88ab9bcd80/miwalelamuselerun.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/35ad2e6f0872680324fddabb08890602/50452109950.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608858b22af15---zanagutozuguwivawurururur.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8653fc55cd---11344945954.pdf
    • http://orchid-daikanyama.com/userfiles/file/morusozaruzapasado.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ec91ac10fbf2c4701e9778afefbef9bc/24777331031.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16088201021f34---nivubizewelilagetefajukam.pdf
    • http://lab4050.com/upload/editor/file/rupizobelojaxu.pdf
    • https://alternativecarrepair.com/userfiles/file/16678854267.pdf
    • http://blbr365.com/userfiles/file/1624369585.pdf
    • http://reutlinger.pl/userfiles/file/54601595710.pdf
    • https://theatresaucinema.fr/uploads/file/timenipubunosomutu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=best+fundraising+campaigns
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb89.bin
0c1917d4a65cbbf8512ac8b96668b43f502655e8195111b7c561e02b0bae2457		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB89 17052 bytes
font_01_sfnt_off00011825.bin
5ee65816dd1d6d8883efd9095ac50c845b18949a118daaa78d8dbb2243aadad5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11825 10948 bytes
font_02_sfnt_off00013156.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13156 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.