Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3484387823be2cc…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 08:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3ecf3011068ac68075bef5e7d4ce20f0 SHA-1: 127b0a40af9b0c2f5e7caa9b7900a1b61771b1e7 SHA-256: d3484387823be2cc9cf47a31d926f866459f37ede51777c8f2f4cb4a6133c35d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised CMS platforms. This suggests the document is likely used for phishing or to distribute further malware, leveraging external resources for its malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://bestbuyfromindia.com/userfiles/file/wemunajedugukowoda.pdf In PDF document text
    • http://worthingtonpark101.com/userimages/36504038045.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/11270742651.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/30143469612.pdfIn PDF document text
    • https://codecs.ro/images/file/33343272487.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/novil.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/daxikufori.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/8fab2d3c8233ca27c51ea356e997caa9/pobiwamawigowemapenubude.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6c43c3786---53597584.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/boug1bv3n761urh6oqo8tp2qm7/95517394180.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210625140554.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16079a0e16b320---zadodasifedevabekerekubar.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/teredoxaxuvoxolalo.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/xukeropojutirolu.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/ip6sl70nivoa1ga2v8b53r7739/95129094082.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f7009d340d3e2933a14c256ccdba7025/toxem.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16102b1ccc3826---xuxaludome.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/4af21f78221df8de9c7480a14d297282/18341686458.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/43242193814.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/nasapugu.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/wikirerepivubugiza.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/2415966454.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/17620928730.pdfIn PDF document text
    • http://signauction.net/userfiles/file/bidogejojobez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=just+in+time+and+lean+manufacturingPDF 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_off0000dfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC1 19280 bytes
SHA-256: 44932163b6146516f8d68fc675640d9ea99fb5d80b774351f383a3676f70b7a7
font_01_sfnt_off00011080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11080 10788 bytes
SHA-256: d707dc9cb28ccf06adb2ed3e8a1a7956e6501adb6d1e6dd2487857c5d9cbe75b
font_02_sfnt_off00012922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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