Malicious PDF — malware analysis report

Static analysis result for SHA-256 45476ea9cdbaee66…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 01:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6ed561cf096fbc0cabca81db5d4c87bd SHA-1: 8d7fc87656096e0a1b09dbd754e272ed0e2d1dff SHA-256: 45476ea9cdbaee665b26b11931c09363190e07b47a22b24f810bb1d5fbc15105
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or link farms, indicating a phishing or malware distribution attempt. The presence of a 'Download Now' lure and a high ML classifier score further support this. ClamAV also detected this file as Pdf.Phishing.Trojan, confirming its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=kannada+news+paper+pdf+free+download PDF link annotation
    • https://alves.bg/ckfinder/userfiles/files/77930123101.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/sogafibu.pdfIn PDF document text
    • https://uangraja.com/contents/files/56656249565.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/0oq2fl87bmil2f0j7djfr42rb7/33380349385.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/davizububobivixu.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/ef489a145195fe0895535e8aea3bdc3d/91255603891.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/mumabarixiluxatufewobagu.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bfb763d39---tirevajidiz.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/zivugiwibuxigor.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/4a2440e6990dae0da7a5ce408faf01cd/jovobafalazanek.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/f9d2c9eaddb22956c47a91847fc5eefc/48636305724.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ba0bs7omvmlb97levpraa3dt14/taruwibakuvemowimuxonuxe.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117f74ed5353---riwirul.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/18428166128.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16102e4d56df3b---17011776794.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/rewalumimobabagerigi.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bbce5bfec---matedatebu.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/10347859922.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606e40fc976bf---13686360824.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/75226758822.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210518191904.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/c49g5ue22e61m1r4snot8gupne/77977359261.pdfIn PDF document text
    • 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_off0000db50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF367 10380 bytes
SHA-256: 3cf2e38a2a362a8bc8e7c0672e2685140c3a0f01651a060f1649e8b8603b18e8
font_02_sfnt_off00010b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B05 18920 bytes
SHA-256: 0febdd41caca80a7d6f2e7e9ee7ddb10dfdaebf86447a7111c85f29425f22aaa

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