Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ab059abffe6355…

MALICIOUS

PDF

87.5 KB Created: 2021-09-02 05:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a9f732e323bdec8126c7abff2702234 SHA-1: 9f2193e2d477fc12902920b3fee6be4db13999dd SHA-256: 23ab059abffe63554aea1dc44fc1fa4072f856f623a448b9eb8c8c94859a493a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns are consistent with techniques used to lure users to exploit kits or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pistant.ru/uplcv?utm_term=rom+is+a+which+memory PDF link annotation
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/5839a869aff952390ec1213cf0691111/95735957111.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/63238338484.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/felaterijezo.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210626174318.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/40642439519.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/j538t0mo5ndtu8bo3b4s1dn5ut/valopemazajolufejemax.pdfIn PDF document text
    • http://chongros.com/userData/board/file/84965107701.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4541ec3195580a80f093aae080b60e93/tezatu.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/rofufipeluluj.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/76448926596.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/malabepijitujixuna.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/40153764462.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/49322aea48383a18d613860ab6b2f3d2/kedowumudaxuzosew.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac76e934f---28347773504.pdfIn PDF document text
    • http://gestmase.com/media/images/file/62572670447.pdfIn PDF document text
    • http://rotang.net/userfiles/file/4425767646.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/jezudazodelit.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9a804c05f---18565482612.pdfIn PDF document text
    • http://prota.ru/upload/files/nukusewufazobowakenafu.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/39378763205.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/9bf24u5jnk00qgn58a6j9h6g4o/35338333124.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/79464829872.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/p53e8ouldhjebgbgbi6gtrh0q2/dibuwapakamotazenoki.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF243 17836 bytes
SHA-256: 6a1619adeaaf04bc3645f0bde159ad6e104df385e3a559e7d29fd1728c224120
font_01_sfnt_off0001206e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206E 10492 bytes
SHA-256: 3f826112b3673e764bc9f8311495f3d33723fb5ed299787fcac9de8d90c00aea
font_02_sfnt_off00013865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13865 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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