Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcec1b6e4b88528b…

MALICIOUS

PDF

84.8 KB Created: 2021-06-30 03:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96cbfb96001b72cbacd857a5382af2d3 SHA-1: bc3d92b017f4d1f1e7301c4e8a55150f16be5471 SHA-256: dcec1b6e4b88528b536bae4b2ba7836573452ecf265d38fcb9a621a829eaf272
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and URL analysis point towards a malicious document.

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 https://garglob.ru/uplcv?utm_term=warframe+system+requirements+2020
    • http://designpavelzapletal.cz/files/file/kupezabofavijar.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/60225989061.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/44c127878d6485f76242a925c7789031/mutet.pdf
    • https://alatheir.com/atheirwsfiles/file/debavakavikejikapa.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af87d83414a---tasasolavunuvidib.pdf
    • https://familienarbeit3plus.ch/userfiles/files/69292635160.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a021032b2e3---48516735870.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/1g6kd96jhbuv19hprlpabm3qc2/15148396893.pdf
    • http://iglozawiercie.pl/zdjecia/file/lesinubeve.pdf
    • https://yuss.it/file/xekegebusuvomexizerafu.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0d4aef9ad---11963291014.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddf0914f38---baxupigusidetaxo.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092331ac734a---50358087948.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160984c0215899---44450871933.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/dd77b07403eaec854b814f15c975eb47/32022241146.pdf
    • http://delve-cr.com/uploads/renazebi.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d05d12232fe---kopiz.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/htvh3m0d4scm2k0b54kp66hfb2/64090620198.pdf
    • https://nbtele.com/en/cache/fck_files/file/sesazuxanogodudapis.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a922919ca55---51761674385.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739d76ef330---32418677990.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55c963fd90---31286102066.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/4fv0itgpq4imitvsl74pbt2101/55832621943.pdf
    • https://mintowncoffee.net/uploads/images/files/mopeba.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be12366bdd---barosovemimasevuni.pdf
    • 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_off0000e95b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE95B 16792 bytes
font_01_sfnt_off0001016d.bin
df9a8754d9773d61d90480e1c357aea7e18b1b7c91294c929bc81e76cfe990da
pdf-font-stream PDF embedded font (sfnt) at offset 0x1016D 16948 bytes
font_02_sfnt_off00012ccc.bin
a7ca009623268e5eb5cdc169a872ec39a300f77a669fc2302da8ee3cb10d87e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCC 10804 bytes