Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6110ec9623628dc…

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 06:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eab299e9fadecbf0455f2d313fdb0293 SHA-1: dcba426cf4f05676a0171fde5dfc54b1ac5cec56 SHA-256: b6110ec9623628dc350add0c22f4a6b771aad1c27cd1bb66423f21a9edbd7224
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature, likely serving as a lure for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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 https://cowichanseniors.ca/userfiles/file/bejadutobuxune.pdf In PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/789031752.pdfIn PDF document text
    • https://ms02bet.net/contents//files/82466064226.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/20022781456.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/7656d7779c885d7062bdf29a692dd7d3/77030794025.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/lilowaga.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/kekikiruzobitapol.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/78027721363.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2df4eb240---wasimamamomotak.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/83461321253.pdfIn PDF document text
    • https://ipkameros.lt/userfiles/file/67615326681.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/tufuxukaxob.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/30600774762.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1b9d5e22c---kajalilazebem.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8796f0aad---jobakewejozufevalipagigo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dfd3416e2---laxupogitiresab.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/1901840622.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/6030153129.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/dunujer.pdfIn PDF document text
    • http://tumonjfk2020reunion.org/clients/f/fe/fe8b949e9fe7e5065ccade199761aacb/File/10178141684.pdfIn PDF document text
    • https://coil.hk/upload/files/41338041898.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/xesilaxub.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/topibiresudava.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/df48080280aa040104a9aba13f8fb639/mavebari.pdfIn PDF document text
    • https://memoservicesrl.it/file/mulamavavasebalulelaxorem.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86f06a6d2---xumigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=frank+wood+business+accounting+13th+edition+pdf+free+downloadPDF 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_off0000e16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16B 11520 bytes
SHA-256: 0b158fdd6929dbcd4634e636d5c3fb7ff9d62b120d593723ffa87dc87fa09efd
font_01_sfnt_off0000fc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001146d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146D 15912 bytes
SHA-256: 70e5a752d9e48b6f81b3c249053aa6be7a1e5134ba584183ec852a029f27e56a

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