Malicious PDF — malware analysis report

Static analysis result for SHA-256 d718e84ba8e40bb4…

MALICIOUS

PDF

95.1 KB Created: 2021-07-28 14:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 99fd7287da34ed494aade3c5c1d015a7 SHA-1: a9e312c791ddf4750b415e3c4356c63081e47526 SHA-256: d718e84ba8e40bb4cb78ae8c998685d945d692b05e061d3ec10ffda3c131f874
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous websites, some of which are hosted on compromised CMS platforms or disposable domains. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to redirect users, suggesting a potential for phishing or malware delivery. The presence of a 'download button' lure further supports this. The file's primary purpose appears to be directing users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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
  • 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 http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b035dd14bbe4d5183d936a9d3e2322c2/jawigotojodajuxotufabo.pdf In PDF document text
    • http://munnarinfo.in/userfiles/file/zobezeneronog.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d01a53fb01---favakusolotodemorepawo.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46d5f56b07---namodonedujov.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/99017213375.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/23339299437.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/61606661081.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc3c380c00---fugomiraliralapuruful.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2cc17e555---51086118449.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/97573907665.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/260fbc7e90d217b599cb1b30cdb46f0f/mopirolemotejinoxuge.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/zoronudexagetiraju.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/68006403393.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/868698f67a0916538f1cb7af8960557b/5870529454.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/39677803228.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/49856919033.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609815d825d40---47379780967.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/e84c724e577df841a2f5f5af6aff809f/62325873176.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/puvilu.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/38784662848.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/57757781123.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077121dc82fd---79994890790.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bae28856d---dafipiwajagi.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/69265792980.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/bekikigefoxululunisaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=i+am+a+knight+rider+song+download+pagalworldPDF 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_off0000f4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A5 16556 bytes
SHA-256: 236e9581b52850e8c7ddd621775986e63e2cfa90f3a70ac4d0e450f39be276d4
font_01_sfnt_off00010bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C7 10968 bytes
SHA-256: ee2bc2dc8b24ca841a324d7220dfc32265adb2094fe768baa3b518e66b91e2c5
font_03_sfnt_off00013cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD2 18240 bytes
SHA-256: a2f70f0ba56a380d14fc0b311e2114a6a503f237f35e44d92ff0f5173fe9deac

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