Malicious PDF — malware analysis report

Static analysis result for SHA-256 400ef9e6223345b3…

MALICIOUS

PDF

79.3 KB Created: 2021-09-20 19:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a7b7a7616dcfe8b10f27013018bee8c6 SHA-1: bae9a615a2989cd6f4bd5023d99865c45e5ec538 SHA-256: 400ef9e6223345b355b2dfe98e2fdceb30848a2c4410cbabdc206ae5b356b94e
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple heuristics pointing to compromised websites and link farms, suggesting it's used to redirect users to malicious content. The presence of external URIs and links to potentially compromised CMS upload storage further supports this. No scripts were extracted, but the PDF structure itself is leveraged for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9a724ef40d7c72b3635193b3022f1901/notopufabamixu.pdf In PDF document text
    • http://wedooverseas.com/userfiles/file/monazurofovifizupituxuza.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/nidizapuposowi.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed3e181826---310875018.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/fesafanisuguv.pdfIn PDF document text
    • https://shidoremicrosys.com/media/mevogofo.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/76916933795.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/97495139018.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/19697125239.pdfIn PDF document text
    • http://masonhn.com/d/files/kizofofi.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///rabalisazupok.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/75682422371.pdfPDF link annotation
    • https://dreamscapes.ca/dream_scapes/userfiles/files/widimusijakojo.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/tuminulijiwopupibuxutatu.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16131e2432c08d---noroluwuvodenowibenixapu.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/86283533679.pdfIn PDF document text
    • https://flomogroup.com/upload/files/30438478140.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/zibozina.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/lutobukagi.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/8994554718.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/felanavodaxanonugoforure.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/fapurobumetafep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=cara+menghapus+akun+gmail+pada+androidPDF 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_off0000d237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD237 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4E 10964 bytes
SHA-256: 666c4a8a92bc11433d6deddd19780aff57ad2819fc4ecf955b253729da21341c
font_02_sfnt_off0001033f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033F 16268 bytes
SHA-256: 36e340d74cb6b3be43b81f3432f83a450091a8454f786a71aa35b6519c592c4e

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