Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e4334598c342b1…

MALICIOUS

PDF

84.2 KB Created: 2021-09-04 02:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 76e5880502587d706d13875a25698948 SHA-1: 1586041a51adcf200a505245d5fef6a74e85b0b7 SHA-256: 98e4334598c342b1ec30f1e5cfcd79ebe75c34b86750be88f6762c7a6b3cee4a
176 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms or disposable domains. The presence of an IP address literal in a URI further suggests an attempt to bypass domain-based security measures and directly lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://a2designbg.com/userfiles/file/ruvubonosewagira.pdf In PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/vk52dapeblvp68utdmrsdh3jqo/36927207179.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/dc0c6b440649b799b3df511ce519860f/79137747095.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/masusipojijawexise.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/tefarenufaropidapawurizu.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/lodoluveraworaxosowolire.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/95623125306.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/zesokabo.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/46157725550.pdfPDF link annotation
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dr8t886lhha99252v9i9rirrk1/vufatefamufovusixowafij.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce5c9a7a6f---90042744603.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/55720701986.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/1d97e718a02107e689da86dd670345d7/18383853177.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16128e26ac3f6c---27031196337.pdfIn PDF document text
    • http://www.moyekolodin.com/files/ponosus.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/wejuxajusinaxizolonipi.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-17/20210517135809363829.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/9211143983.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/87243856347.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/tufufomitozonanuzininesu.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/pegusidalusevefoximodoz.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/xugegusil.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/tumobakawanalimelitot.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988add652f0---62913482363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=manualidades+con+carton+reciclado+para+el+dia+de+la+madrePDF 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_off0000e07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07B 18760 bytes
SHA-256: 165893a32a3266fa520e453bd9efb9b632deb2c55adc1caef74c5fa55922b265
font_01_sfnt_off00010fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12801 10768 bytes
SHA-256: 66b13274351e886abfca2858d65f9259c0c34816834f1c3268749ce13330bb11

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