Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f4d56f9dc31f8d…

MALICIOUS

PDF

75.5 KB Created: 2021-09-07 13:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a8baf640c03ce85eb69dd099e70c49dc SHA-1: 3ce0f11a9f00b32c387613d9c59ad41b24b57c3e SHA-256: 64f4d56f9dc31f8df1fa1bbbefb9d88a1da1dd8b93a6f5b6993803f9394ed08b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which are identified as compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically highlights the nature of the links as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://sooclose.eu/upload/File/53734075546.pdf In PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b165ef986---9164911291.pdfIn PDF document text
    • http://guowangcable.com/d/files/30116645214.pdfIn PDF document text
    • http://huiking.cn/uploads/file/112253223022.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-28/20210628144905774264.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/52445804820.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/3307957406.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607419b389f45---mikanawegaj.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/tajovepatutomun.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/85nujkq2begrdp8jms6sb859v3/tunovizanolunozovojoxasow.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/leraxo.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/fcf1bdb09bc2a24654756fe7425257d5/repadudel.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e24c07ecc---34895652302.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/6899538339.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a30b44a435---wukukasazixos.pdfIn PDF document text
    • https://xigmatek.com/upload/files/xigafigoxud.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qol5rs74rglfci61kuvqtuoec4/34079148193.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/nelaponagivokixus.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160fccfe19ef94---kujaramuvibuzibeto.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/4286b7c8d119fb3e8391e8ae3a58dee9/zimoko.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/30167544179.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/60692995338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=sql+server+interview+questions+for+experienced+pdf+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA9 16940 bytes
SHA-256: 3df5c424321ecd64e07ea0b71662f6a67b59b27d671a92b2eb70a277c6907f10
font_02_sfnt_off000105a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A6 11188 bytes
SHA-256: 6031c466a05b6502176af96e12aafee9a2547f12664b340d50575feb391f854f

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