Malicious PDF — malware analysis report

Static analysis result for SHA-256 be71a1c0c3903ccd…

MALICIOUS

PDF

89.7 KB Created: 2021-08-24 07:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9e904eb3edfd3051d157adec5f4c780c SHA-1: 9dfea26a57d86899811ae9f1100562d0a0817b92 SHA-256: be71a1c0c3903ccdf1cf9c8ffcd6e823309c463442ce4cd12d9ae9fa6eb6ad46
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, with numerous URLs pointing to websites, including those hosted on compromised CMS platforms, likely to lure users into downloading further malware or submitting sensitive information. No scripts were extracted, but the heuristic findings strongly suggest a malicious intent through its extensive use of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://954move.com/clients/4890/File/57184462075.pdf In PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/28179961827.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e55924c40dc---ramejenekogoxilijopowav.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/75895444054.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/vuxexufebix.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608319a0b71f7---wulivadokudugolekepejowa.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160830ee291715---36791923522.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610fbd0131a34---20012571198.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/20663797969.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/2stdrdaqrdi5ss7dt7385vl860/26073170011.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/nonadukusaris.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b71760a138---60414559753.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/36305796869.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/850fa71657fbf175b4a0101fe0c001ec/wunikixowuzonak.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4153698e4---mulesiwinokizobumos.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/4739b537dba4c399522d90c2996d0bbf/79260164647.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/rafovexoxug.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083f14c4c947---80336771616.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/nenejonoluwekason.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f76812ee7---90689692989.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/9823143ed9b7404db3d69f81d68683af/fizoxamafowanazab.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607920e38fb64---41318732311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=a+christmas+carol+poverty+quotesPDF 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_off0000e41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41E 16616 bytes
SHA-256: b1b2c13fbcfa057c4ad8085bafc7dc45dfed4ac3ebdcbb4f7f3ad26b7d799ce3
font_01_sfnt_off00010f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F28 10940 bytes
SHA-256: c66f2afd1e49fb1d6b18e5a013efddc2df214a02524a43328a298e17ff196126
font_02_sfnt_off0001289c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289C 16060 bytes
SHA-256: c6549f22251a7c672008a5db7f07691c42d3183154b8b4cd03972a27c3442328
font_03_sfnt_off00013db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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