Malicious PDF — malware analysis report

Static analysis result for SHA-256 6612c4aeedf5fe62…

MALICIOUS

PDF

82.0 KB Created: 2021-09-01 14:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4b737fc86e2714cdbef6ac3975c9294e SHA-1: 01b1f9ba5cfbe96f8c1a64b46fc7a30b405acc58 SHA-256: 6612c4aeedf5fe62e5a2222a18a1fdbbb1e677ffb5809105d8beb55d574e86e7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://irlanc.ru/uplcv?utm_term=company+name+change+announcement+letter PDF link annotation
    • http://yao-cheng.com/uploadfiles/20210812234930.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/mimd76n5inrhk6ihkhf4mkjk20/pizogulanepevixunuzox.pdfIn PDF document text
    • http://sddshchb.com/userfiles/file/Fl202107300232433390.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/zudasewizukusuno.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16092069b4045a---gonez.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210604114358.pdfIn PDF document text
    • https://terrach.ch/file/wevezetawuwezutajupexes.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/85262116914.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/40013474968.pdfIn PDF document text
    • http://hevolta.com/upload/file/jinutezumer.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/sekemido.pdfIn PDF document text
    • https://laser123.com/geektic/files/vavudisigegezomatukatila.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/84369580134.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/datuxub.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/34423365466.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/1c0194367930da72f149ec3f57c73eb4/naxobozotopugo.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/kumevezuwiduvupodiboman.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210815131712.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/7725937915.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/nuzajosujoranemum.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ac9e73eb9---sunoxakebojesorit.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706a62cd8bb---posedowujizomeme.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072799f2e9c2---vukamajuxonov.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebb7325216---jatofataboxuv.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5ec3a7ec0---wifok.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608098aeb8fa6---fovoropipekanufe.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/banuk.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_006_off00010459.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10459 18228 bytes
SHA-256: 3ff1611db34305fdb784987de108d9f59d30862ac9db9747a72a8770910999c8
font_00_sfnt_off0000c146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC146 10804 bytes
SHA-256: 26e3e5e7224fa7b03c3b158431e1954caef9f1fe08cace826c7678b883fff1b3
font_01_sfnt_off0000da05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA05 16372 bytes
SHA-256: 8dcf00694651db390f5f686b730e633ea572536d7d2a00abb8cd423eafd6889a
font_03_sfnt_off000120e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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