Malicious PDF — malware analysis report

Static analysis result for SHA-256 331455d0f44bacc7…

MALICIOUS

PDF

87.5 KB Created: 2021-07-30 21:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 17bfb67dbf96213a28188de55290891b SHA-1: a28ee333646a1ee8b8033bc35ea804d3a5dd9575 SHA-256: 331455d0f44bacc7fcb461dda5adc1bbc7a6eacdb4a3357ea6041453b1ef9469
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, a common tactic for phishing and malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a method to bypass gateway security. ClamAV detection and ML classification confirm the malicious nature of the PDF, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://canigrup.com/userfiles/file/bomikozevoxami.pdf In PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/7be1e25f5e3201c39e9a8c8b516f7875/70072091201.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf268e7d15f---melamosilabonafeviliwupo.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/10d971165335b134d97a7af9435b21df/dobalapitofutosogejali.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/majibavo.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/34703400983.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/wivuzobodiwewegobegigi.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091afce3bb78---gibujejogiruzeburejujubut.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/ptlehggi258c88qhpk1jeir4st/zezoruxupa.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/da45163bd183d50c87691b2fb802a869/76219116202.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/cp5u6eu2vt7sijfhea08alqmii/79754555783.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/f077ca6bb6705156cd0cafbc1f8dc9d4/fijutogupuzuruf.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/57368215928.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/72886456816.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/lovuxupa.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/16369707897.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b02dcefb5f623dd3844d69fbe3f5b8ac/79310843884.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16087615ea0485---zutorujulapabetazugoda.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/zamavev.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/mepupefuginomefawavejola.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1dd77f1318---nezugujaxedaboxitetid.pdfIn PDF document text
    • http://imgfil.com/1bfr0hIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=pacific+physics+a+level+vol+1+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD913 16652 bytes
SHA-256: 1d3632ac6870cc70b75168291e5771c1621ada6ef0e87223e7265163a3226415
font_01_sfnt_off0000ef9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9A 17928 bytes
SHA-256: 87c1673e18218083753a4ae521a090a84067e0499702cae94d23434e44cd8ea4
font_02_sfnt_off00011f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0D 10648 bytes
SHA-256: aa92081af6d925ea17af1d5d4f949910a6a154bf7311c827b852fcc708aa49cb
font_03_sfnt_off000137a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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