Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba431aa66e3a3c9…

MALICIOUS

PDF

165.0 KB Created: 2021-07-22 01:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 149fe7df054dd2b700603a19683518f3 SHA-1: 13c3e5fd59d2aaa68fe4c567ae5de58cbc7c7153 SHA-256: aba431aa66e3a3c9c8cf9a0c4ceec7802653fbd3b6bdd7a231e84195b535cc4c
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability for client execution. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters further support a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9752

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://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084d28772160---rezazulel.pdf In PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/06efdc95fafc337b389325ef9a2cb877/27923002442.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/14bb5c6e5a69fa62239384f618f9ffcd/53313002481.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/8acc1e97db5fd05798d0aa79bc5ca080/74744011011.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1cee6d01e---kavodawo.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/tobevivajoronovope.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/64222132550.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607524f28e1d2---nivopesipekolojeb.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/guvep.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/90010793525.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/mixivefabokil.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/93712070402.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/6144352446.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087c364c9ba2---tezin.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d45939667ae---tojit.pdfIn PDF document text
    • http://gistys.com/userfiles/file/48840092689.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/darogumikelu.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/mafugawinevosedelokozub.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6bc2523ba---92189228410.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/15749657182.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/xebetavujugirumufafe.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/9856698b104062bdbacd2c4e13f9e778/72929244900.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bd852b20db4---tewafuvosarigarepi.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/virodikomujo.pdfIn PDF document text
    • http://abpaluso.com/upload/file/25582047632.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/solegixejomudusigak.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d316c3e8cb---zekipek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=the+flappers+of+the+1920s+challengedPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21E35 19296 bytes
SHA-256: c2105d1098c513f8c2aba8fcf75ec0659ff3e2502e176a19c4cbb0af8c986101
font_01_sfnt_off000250b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x250B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000268cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x268CF 11232 bytes
SHA-256: 5dad594f888c97f8782340590ceeb7642f4a68cca5e3ac662c948d5b3072cd9c

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