Malicious PDF — malware analysis report

Static analysis result for SHA-256 a30f36cbcef93a2d…

MALICIOUS

PDF

81.5 KB Created: 2021-09-15 06:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 573328671a83237bcd52179f343f8982 SHA-1: fd28ba7765aba8ebb0c535ac18ee02f3da964164 SHA-256: a30f36cbcef93a2d9101142f7caf91be242f627954c4b3f341ff2fcd08370a9c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348ba41685d---8233181419.pdf
    • https://valerart.com/ckfinder/userfiles/files/jametejomo.pdf
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/88982907676.pdf
    • http://letresorellebio.it/userfiles/files/zizuk.pdf
    • http://zechnerbau.at/images/content/files/zaxazetaxuf.pdf
    • http://firesecurity.sk/userfiles/file/tigavug.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/fd92d116c3aa1659dd8952045990c737/tepatodo.pdf
    • http://tokyo-sanritsu.com/userfiles/file/76793636195.pdf
    • https://tims.ro/ckfinder/userfiles/files/71648793260.pdf
    • https://umiyawoodworks.com/fckdb/userfiles/file/9652489299.pdf
    • https://nileagriculturalindustries.com/file/27641329839.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/2befbe96b37fe598af9b6399d9c863e6/84100786211.pdf
    • http://nct-vn.com/userfiles/file/zigujimubotunosu.pdf
    • https://brakos.it/file/7861700622.pdf
    • http://cuboni.com/uploadfile/hong202109052328413877.pdf
    • https://holcom-solar.com/webroot/img/files/mujedasipozobukipibes.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c14afa1cdd89f6aac2c5ad2090184adc/wigejobuxadunutoxovuloku.pdf
    • http://realtor-madrid.com/uploades/fckeditorfile/gapilokutuposoxidowexeg.pdf
    • http://tjsyjdq.com/v15/Upload/file/202197718258023.pdf
    • http://szm.hu/userfiles/file/ralebojabozomemev.pdf
    • http://computer-rudolstadt.de/upload/file/75740920544.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/695a19c099c35e591d7b8be20b4840af/22414936681.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=dragon+ball+heroes+episode+1+dubbed
    • 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_off0000d3fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FD 16792 bytes
font_01_sfnt_off0000ec0f.bin
f87edaebc3d436e30d50330ea3c2aaa84a8e704ec9cdbbfb6aeb6d4d2f205851
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0F 19660 bytes
font_02_sfnt_off00011fe8.bin
510325bf3d6b0faae20c95bcc98d7a2b262ec5142dd225bdd16b8da8ff74b345
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE8 10868 bytes