Malicious PDF — malware analysis report

Static analysis result for SHA-256 585460d888ba1ea8…

MALICIOUS

PDF

103.8 KB Created: 2021-06-30 18:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 24564a3d6b1c47f7674d3d60f0783c25 SHA-1: 4d6150fb2509aaf275e6fb964864ea3653fb618b SHA-256: 585460d888ba1ea86c3a4e072493be89433c84d85d93d2651fbe5f2a79ddc23c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous external links indicates an attempt to redirect the user to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://medvor.ru/uplcv?utm_term=scriptures+on+love+and+forgiveness PDF link annotation
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16075a503541c8---kitegujivepilumav.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/0daafjrdml3i5dl6tfcd8kvsuj/20447395289.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/37402809481.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723faa65bbe---22107768672.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1624157564.pdfIn PDF document text
    • https://badoza.net/userfiles/file/bekugetolilenuxutifujo.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/35142471174.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/6f6eb982d52b087f5ff2e637d7a4807e/34978328565.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/87469994582.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/61741527017.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/ab734896495acea65e5904951590d394/begewukowogokesod.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160726dedd450a---jumoxibitorizev.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a40ba21f1cb---wolidokogesumonowifejorag.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/77391234930.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/55c14e16a0fa48470971c4c759568aa3/4635050183.pdfIn PDF document text
    • http://planbmedia.hufiles/7770430077.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/59067903354.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983931011ff---85390514474.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/7b5eb5defe37683b008f14007717a7a0/sipunovulofa.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/akj8ltd28b2mbt6ia19s590shv/79412634783.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2cbe483ac---31527943077.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kk2gb96i7es6fjc51kmohpcqt6/41744311134.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/71326163569.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/epeq4shqnt9b945mgokpdcqug2/xilewipanuruxuvixefa.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdb645ecf---desuvuvufebazanod.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000159dd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x159DD 17940 bytes
SHA-256: 591300c7a85f0cc86ea90b08d9283e437a3cb5e8409ef79a31eb489e0d82bd45
font_00_sfnt_off0001169f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB1 16752 bytes
SHA-256: 45e442b233c4b269ac5eeb318534fb5148d5e52b139636a7597b2508ec11ddf6
font_03_sfnt_off000175f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175F5 11036 bytes
SHA-256: 174d34b8c7f533330a6ea61d509d418c786dc55b04111e82f42b119c56df46aa

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