Malicious PDF — malware analysis report

Static analysis result for SHA-256 427c66ec5066f34d…

MALICIOUS

PDF

105.4 KB Created: 2021-06-29 01:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 731a002731d37ce572de3b05e5314746 SHA-1: 6243357e67c09228f22605eab3825e499a817f58 SHA-256: 427c66ec5066f34d189eb242a5fa6eb456c0ef74bbd1226cbf6c61cc8b20d8fc
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple URLs, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests the PDF itself is the lure, directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa3ce49d0b---wenotubusutewalin.pdf
    • https://agrimal.pl/userfiles/file/jabivejixataw.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/4a9mpjv5ucibqfg8bbfi02i0rj/73440659243.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf3b6f2fc0---37624271577.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/ea9odp6f382j9fnj2ef6g2ang7/51500900716.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a125ca16b55---xejomokonubodenupu.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609182acb5e7c---ketanukalewa.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0bcea7d84---zisutezi.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160927af6e6a74---lujok.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/4mkinm09abnvdc5v97589vkr4d/nebizaj.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3982603ff8---dipositil.pdf
    • http://chieusangducphat.com/uploads/userfiles/file/patubabumosagebux.pdf
    • https://memoservicesrl.it/file/82492288084.pdf
    • http://vietthanhstone.com/images/news/file/lerefajikafokagapi.pdf
    • http://costruzionibulagna.it/userfiles/files/jaxopuvulagevijuluxiz.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608515ee8c441---65373792204.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e481b5644f2de611b35ca8610e52bb79/rutesilugenabatibalulabuv.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b740eb8d56e---dixutajom.pdf
    • https://alatheir.com/atheirwsfiles/file/12677053310.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/gm80kh6sgguudc06dfm929nsk6/tajisilirexitonitabewufad.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab21d9a1146---jagowoxonawusikoxid.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=parallel+systems+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_off000139c3.bin
a1bdd97012d311cfd292fcf3ecb5c5b0593ead808ee45f687a4a654b37ffd4d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x139C3 17464 bytes
font_01_sfnt_off00016789.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16789 16792 bytes
font_02_sfnt_off00017fa0.bin
294dbc98842e1bfc2ded6c6cb52df31fec8c31ef46c2f0610b647c52c2ffd676
pdf-font-stream PDF embedded font (sfnt) at offset 0x17FA0 10460 bytes