Malicious PDF — malware analysis report

Static analysis result for SHA-256 9875121ae7d4dfd7…

MALICIOUS

PDF

86.6 KB Created: 2021-09-11 23:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a684f2f7c426b4e54e7c3fdb5f23950e SHA-1: bacd099f32ebb0df5cdb30e3481b3c4cead35b37 SHA-256: 9875121ae7d4dfd78037c3c8a6230822dc34437911cc87e32c44f247100966bf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous embedded URLs were found, including one pointing to a raw IP address and others hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of these links and the nature of the PDF heuristics strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bongkartuantakur.com/contents/files/25615962113.pdf In PDF document text
    • http://s-pack.kr/userfiles/file/20210908022849.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/90421734668.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/xawazoduzoxaruzosumodo.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/fupetedageladotolujared.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/90223334004.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/58752062135.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/worepe.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210903105621.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/ridilodaxabapamewubez.pdfPDF link annotation
    • https://atavio.ru/files/file/rokedulirimenakanekar.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/kusakutisi.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132954f2fa38---lukomotekixepikasowuzol.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/toxet.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/56077926933.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/49186927655.pdfIn PDF document text
    • http://partnercable.com/files/mibekozefezevajevir.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/noxazuromuwuxena.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132d68228e40---xavilano.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/kobojudomesaretarovulodu.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133492351abf---tisijulolasudodazomuwago.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/33407935265.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/44035510384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=avakin+life+menu4lifePDF 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_off0000ee48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE48 10208 bytes
SHA-256: 9856fea513be199c947a39c14babf7aa6860e62e60de10c2af013bb503374c9c
font_01_sfnt_off00010523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10523 18684 bytes
SHA-256: e2c4f26451c5b63a005e17ba432b98deb91ee9a9faa208d6619070ebf9ff3a38
font_02_sfnt_off00013522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13522 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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