Malicious PDF — malware analysis report

Static analysis result for SHA-256 85866138bd149ef6…

MALICIOUS

PDF

84.2 KB Created: 2021-09-05 12:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ef33078298c1bbc1173b45077cda24ba SHA-1: 210ba3d5a1f516f9df62068e9c5ebef3b582b29b SHA-256: 85866138bd149ef66144cff768cc576fdbbd979a5ea1fc088db388d4630f23db
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=muckrakers+worksheet+quizlet PDF link annotation
    • https://nexusmediation.nl/files/10681262497.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210809_111152.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/29222275898.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/retutotevisevovemej.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/f9f8b2bb2852df1de537a04595148837/99869056757.pdfIn PDF document text
    • http://traviet36.com/upload/files/wiwuvetudebuxapa.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/62462441309.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/8869547484.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/doxisitijikixegumuz.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161076d0387899---77451526313.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/sbfbpjd4fkvsqo5j8mrjf3fl1b/sivixalotanapunapobifelo.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/e5vca0d0ogevessgvsj7nq72so/42798010632.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118d4e8a1b08---17064733213.pdfIn PDF document text
    • http://grandbarnettfamily.com/clients/a/a0/a01b80d98e57c38af56892ab55e7d82f/File/vinirariwinamep.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/501ea74541649f9c899715065e869c8f/zosukuxoxetex.pdfIn PDF document text
    • http://abpaluso.com/upload/file/11784235865.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/20218289692.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6dcec4288---korunarakujabon.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/12748746472.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609417f23c505---mevig.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/t11qen8m62fchonfp1o87mda14/vufuwakimisidamu.pdfIn PDF document text
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/dukixen.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/66145161719.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/16237957457.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/3050229730.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_off0000e307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE307 18044 bytes
SHA-256: 07260db72b042e66b5febc25ff4c093328193bb1348e56fa95f711fbdf37ceb9
font_01_sfnt_off000111c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C3 10700 bytes
SHA-256: a14fdc9f355541aaa8875ad77dbc6be67a1c25711f9a691e9108629ddfe6c936
font_02_sfnt_off00012aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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