Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5dde1115d776506…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 04:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ff8118972340a988cbe9ab4a7c3a49fe SHA-1: fefab9cf739e9c6ce046bc6d2648dba7db47db1c SHA-256: a5dde1115d7765065a3ccece0f1eb7c3f03c65484cbb2dddabf9004823d36340
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised websites and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/436c34f9cbd8a8e5f533eef20c67b7d6/wonotufugoluji.pdf In PDF document text
    • http://iwort.de/userfiles/file/68772832052.pdfIn PDF document text
    • http://waltonjohnsonfamily.com/clients/870437/File/mabuvenojupox.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/beverijuzak.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/ae8e7aaed9243b39ed6b27ca894b7b26/92541629479.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/8b601495faad107dd1656696b3ec6ae4/87466034330.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-8-16/20210816190002757864.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/vnbedejb6bckuvbelpqbbpjqnh/71262853918.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/32236065980.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f681c4990c---bijudalazan.pdfPDF link annotation
    • http://language-coach.pl/uploads/files/92590568209.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f04d4304ccd---81975807776.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021071520421173499.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb50a876c7a---koluguvanet.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/supafaki.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/manepizel.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/87620272561.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/loxizanigifusidunadewobu.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/manimogoxetijavatoxed.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/91610464040.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/lefetuv.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113798ca195c---lunatoziguxusenuma.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/q8n13jh9nb50va33shlr1q9oo4/lomemufebumogemipa.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/83049640166.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/0kja7o97817dj6dcrg6f19dpub/50072214522.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/68391769602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=renault+scenic+2005+radio+manualPDF 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_off0000d7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B8 18664 bytes
SHA-256: 9c2206a2c777eae947cad6a8f47889cd176bdce953c04550c64d7a2691112a4c
font_01_sfnt_off00010830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10830 11052 bytes
SHA-256: 92b480eac22c3ef585b433457047f517f4297360bb84f4fe6cf4410a052ae62b
font_02_sfnt_off00012201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1