Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c304a7dcf03a9f3…

MALICIOUS

PDF

85.3 KB Created: 2021-09-08 05:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 77ad201e09621391a8220e1f602b8538 SHA-1: 3993cd5292c7d790e3fcaf68e9b55ce14742a406 SHA-256: 8c304a7dcf03a9f374034e645bdb44b435bd6552caa171204e6a3de3ab7998a6
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple unknown URLs, many hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristic firings and numerous suspicious URLs suggest the primary purpose is to redirect users to malicious content.

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://basyapiemlak.com/yukleme_klasoru/userfiles/file/poxinixemodusejaxugukiwe.pdf In PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20794140045.pdfIn PDF document text
    • http://elpijisystem.com/file/dosibumojanolese.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/57441857200.pdfIn PDF document text
    • https://rockoncharters.net/home/rock/public_html/ckfinder/userfiles/files/59759052054.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/0v602a4van80c53p1rqaaijup2/xanazebo.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202108/file/84019937982.pdfIn PDF document text
    • http://foxadv.net/file/22905819083.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/bisetoxa.pdfIn PDF document text
    • http://aliotoconsulting.com/clients/862286/File/24844741302.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/86304275602.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16097e2379de92---51407812653.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/c180eaed1181482b85833fb05da80855/pojolujodoberilobosiv.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6428dc6a1---52745500375.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/dazes.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/65384062014.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/9737019134.pdfIn PDF document text
    • http://asfalon.com/__files/file/gemujepisazodaritosugel.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312691b8d98---makotizuwimemebovixeg.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/98030748041.pdfIn PDF document text
    • http://webatnet.de/ckfinder/userfiles/files/koviwesi.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809df05bb22---liwumubulanejegowufefegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=startup+enxuta+pdfPDF 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_off0000ea94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA94 17724 bytes
SHA-256: a013ee432c3788e15b5d843655db806fd835187fa57ac7329c03d6288eac0551
font_01_sfnt_off0001186a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186A 10340 bytes
SHA-256: 11ea00ab06a8af6cef1fc63b87c809f3937993dd6ea1bfa4d28d9f165d0d81e2
font_02_sfnt_off00012fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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