Malicious PDF — malware analysis report

Static analysis result for SHA-256 66cbfc4cabc52ee8…

MALICIOUS

PDF

132.3 KB Created: 2021-06-26 01:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f440736296cf186ed9e8f9a3d4eedd9f SHA-1: 3b0aa9772df9fe2396bd3d7ab0e3b3e2a2ca0b16 SHA-256: 66cbfc4cabc52ee820dce340494ade33b7f52b1b5c5892fa7933bd5bb56f386a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised or disposable domains, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns suggest this PDF is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://amctop.com/board_data/editor_img/file/202105101150.pdf
    • http://reicar.dk/userfiles/file/biriwitovawidaxepu.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e1ae32418---najenikowadujewanuwijo.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/22242936038.pdf
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/7esms9shgo47g7iq298ifmilkf/43118988187.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/ac6megbo6pl9vstdlhu22o87tn/julimowokonuveruk.pdf
    • http://accomplishtheimpossible.com/userfiles_ati/file/fisojevudumikajis.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/84vrg4ed35m9lgg9ck5ip69v55/7114132756.pdf
    • https://aymsoft.us/aym_image/files/52167317708.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5e5763d36---73720816816.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/0ob7j8bvm4ocv6km4fnsoa8in2/43157309591.pdf
    • http://www.biotanika.pl/upload/file/xanabajoletagorezifesasa.pdf
    • http://cabinet-blin.fr/ressource/site-image/files/jetego.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b21465d7ada---razesezarawetoperu.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e61843393---46710038470.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/0e4d2364609ec6fea1203b62d3662635/70406667309.pdf
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/saretupojakarosezowus.pdf
    • http://autobedrijvenindex.nl/images/uploads/tewepojokunogijokowowevuz.pdf
    • https://alianzatours.com/imagenes/file/92150328502.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b26766bf38---13176614977.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=logarithm+of+a+number
    • 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_off00018753.bin
342c5b09334d8f93645e40b9a3f2a6fa8d9b77ba76b7a8eecef979fb92bec6a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x18753 20020 bytes
font_01_sfnt_off0001bcb8.bin
eaf7de7c51d5da15085aa0b7edbf6b159b446bf630a1494cc771aca905d85ea6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCB8 10644 bytes
font_02_sfnt_off0001d4df.bin
ddaf406db7dcd027777cf157fae23d9923176fc847e75eb443ad96055333e8cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D4DF 16136 bytes
font_03_sfnt_off0001ea3e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA3E 16792 bytes