Malicious PDF — malware analysis report

Static analysis result for SHA-256 240d88ceff1e707d…

MALICIOUS

PDF

84.2 KB Created: 2021-07-07 23:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f20526cef5d23ccbd58606d46d775eb2 SHA-1: faa36de7a16b91587cb70b1ebb0a9212b8303924 SHA-256: 240d88ceff1e707d391147f8ee9025786e88c762c1bee92d85db57c39011ed63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as Pdf.Phishing.Trojan. Heuristics indicate the PDF contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d01d5f7b1---tupagepomiwizaveravag.pdf In PDF document text
    • https://masukpt1.com/contents//files/39065084635.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb00b73e9ea---farumogarupasoxazutime.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce37cbef8f---61411484435.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/vl3022ld8dvnjodjrkekvd4ogv/pusidemuredeji.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/59327888844.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/6893994232.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/muwamupijurozipevukegijo.pdfIn PDF document text
    • https://medius.sk/userfiles/file/87208932230.pdfIn PDF document text
    • http://netpost.vn/upload/userfiles/files/66307843119.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/vefesoju.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c855bf734fe---89485407108.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/86313549231.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3070b14c83---gelelovobovore.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6905800f8e---zesinivasupevuk.pdfIn PDF document text
    • http://dongphuctqueen.com/upload/files/88359751679.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/d1da0eaccf77f4cc32e56e63472f96a9/panut.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/78645953177.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/tixebavemaluginaw.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1965b5f757ba13293192ef7fe611413e/67044324324.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/70bffec1814010383ab571f362e282ea/zumugexomir.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/55666930728.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/legixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=converting+metric+units+worksheet+with+answersPDF 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_off0000e62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62B 16904 bytes
SHA-256: ef443d023943acd81c3e4ccc0036d799027dc1ed7e0e4f6c8f183c1814a7fa54
font_01_sfnt_off000111b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B1 11004 bytes
SHA-256: 671642648bef522db3271c2cd5cefdbf27f2f343cdcdfd1736cf15ab370982ba
font_02_sfnt_off00012b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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