Malicious PDF — malware analysis report

Static analysis result for SHA-256 b62a0ce79ad4e40c…

MALICIOUS

PDF

187.7 KB Created: 2021-07-02 02:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 78d98849dfc3e81ce01e248eb4fcc736 SHA-1: e14a04b711fd95bb0d93758986e07f74d3c87d7f SHA-256: b62a0ce79ad4e40c6bfe3e161044ee72bf9ce65e0fd36b13652084a314f706e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, directing users to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to lure users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9692

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://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/592ba009f88fcb2cd290f917b951e00e/julawog.pdf In PDF document text
    • https://hospvetcentral.pt/site/upload/file/38439649946.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/47e03d97321fd7a22c7a89451a01f352/75829083640.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fcd24dbeb---43621847512.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/51607459015.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0f5e44f86---35742343973.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/5946573871.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b07f506fdff---2967082743.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8a48e693d---58985480818.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210524020056_1214159770.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee5084453e---88258618067.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/85066079125.pdfIn PDF document text
    • https://areicon.com/images/file/wopul.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/uib7poekvrgrgvp48hq8cpe7vd/vupabubatoresox.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63409a3e40---pogis.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/65d835db2e2a7025d4517fd20bab4919/80647933111.pdfIn PDF document text
    • http://elm3rad.comfile/70608701410.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/sibisumufajawefu.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d513702ed9b---29187662613.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0272acde25---14554088422.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/80859603882.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816f483fa96---gilubadonorefosaga.pdfIn PDF document text
    • https://unosms.us/userfiles/file/juxajinumu.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfb7051e53---matob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=you+have+been+faithful+over+a+few+thingsPDF 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_off00025988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25988 16232 bytes
SHA-256: af293b2b60dc5e826b00d8953dd18f37a59bdd939ad7d7593537948814e7f124
font_01_sfnt_off00026f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26F4A 10868 bytes
SHA-256: 217de7edbf52cde822acd32016ea40bbe7ec88609f3231f379afeaa87b561719
font_02_sfnt_off00028866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28866 26948 bytes
SHA-256: beb93419ebfb3e5106dc1840fbcbe09db305092cb419fbdec0a1c6d1e567eb5b
font_03_sfnt_off0002c6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C6B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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