Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c261ae2cf387bee…

MALICIOUS

PDF

88.7 KB Created: 2021-09-23 06:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 09c801fac229e314cfe5efceacdaa2a6 SHA-1: 5c2739cf4c80228d878f278ed73c151b35011c37 SHA-256: 2c261ae2cf387beefa0729e18f53f494c15e17c14c62531c137dd7022cd0205b
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. The file's structure and URL distribution suggest it's intended to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4603

Heuristics 5

  • 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
  • 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://hit-air.pro/ckfinder/userfiles/files/86023582298.pdf In PDF document text
    • http://www.ecvbrass.ch/user/web/file/81729201644.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381a2b93777---81968845101.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/73428759440.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e693bdca7a---seniviloxakelajub.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/wevojefijeligude.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/36824569526.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/fatevuxas.pdfIn PDF document text
    • http://skncn.com/u/files/98557899161.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210922190804.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/29181130754.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/sinumajumebetisinixidumif.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/45639752778.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/67913825956.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/92532869346.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/5408660205.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/68060417279.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/32d3780413e2f3af588cea24b42ded65/31400138442.pdfIn PDF document text
    • http://logicamail.it/draft/media/71894728940.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/pupuwuvijavafevakin.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/sulideput.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=naruto+shippuden+306PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001046a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C81 10984 bytes
SHA-256: a6eba42c0db46519ff40fecad5a800a20e7cdd3ca70654b771b5a920825375c8

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