Malicious PDF — malware analysis report

Static analysis result for SHA-256 f49a35a718c32fd2…

MALICIOUS

PDF

77.4 KB Created: 2021-09-04 09:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dc8b5a1d61f02acd70fbbed3d4014e1d SHA-1: e78133b6e6723bbdfc17b59b3706ec8280f233ed SHA-256: f49a35a718c32fd2b60d2d5ed44d076d4582bb7257513301446da392db7b1339
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous URLs that point to external sites, many of which are associated with compromised WordPress installations or disposable hosting. These links likely lead to further malicious content or downloads, serving as a distribution point for malware. The presence of embedded URLs and the nature of the heuristics strongly suggest a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://archi1919.com/smlclub-files/file/jiwize.pdf In PDF document text
    • https://permargi.com/files/galeria/files/nafefenidumofaberabodiw.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/80981997064.pdfIn PDF document text
    • https://emprenderem.cl/files/26068868871.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160800513b4e8a---26272687231.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/dupan.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c70a29077cc---rusotejaru.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/84387174789.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/tsl8j1jdo162sc7215i48a4ep5/dabir.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/wawovowisipiseroju.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1b096e0fd---24901056020.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/b7p3u20345t9bpmp3crgdos1l2/pexamutakevapapejujebix.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/kemuvizatovegoregumerine.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/20529169022.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160858cbe94dff---wirozoduxub.pdfPDF link annotation
    • https://yumasri.com/assets/ckfinder/userfiles/files/vozosifixoxiwugixob.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4d10bd073---jazipogokigotodumibanulo.pdfIn PDF document text
    • http://qqwandai.com/uploadfile/file/pebuxovilasizataxiluke.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e2f27cbd9---59642047362.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e28781d23b1---82692391818.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/7299996346.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/vodenuse.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/5i9m7obujkt6difgf0jjhln971/47700348313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=kenwood+chef+a701+repair+manualPDF 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_off0000c53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53F 18860 bytes
SHA-256: 4ffdf4989fcd5aa236c414c03ebff9a495e438429ec24a736387f6acae230d4e
font_01_sfnt_off0000f68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68A 11020 bytes
SHA-256: c763cc9a26788192ec928af28c7fb1396cff80459b853e9f545f8fcb4f2c07ed
font_02_sfnt_off00011005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11005 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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