Malicious PDF — malware analysis report

Static analysis result for SHA-256 25914fcd6de6085c…

MALICIOUS

PDF

91.4 KB Created: 2021-07-02 20:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 680628f8e4018c31759df51fb4bd9f88 SHA-1: 49b21c2f7c89a4551cd45b70a5513b1cfcec1578 SHA-256: 25914fcd6de6085cd4a22a63a69c8e21245d2f818839b49174bf1d949fd09018
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://archism.ru/uplcv?utm_term=3+year+old+throws+tantrums+over+everything PDF link annotation
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096bf2b7de1a---11207150052.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a929907b924---garalajewafulo.pdfPDF link annotation
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/5faf91f853543ab8e59792cc9334a210/51829409860.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160acbf5daf4b5---xodigojegaxivimonodes.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/xatopogetemojezomatuxidul.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210621040011.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ddd804eb8---56984065237.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/41030451023.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc2eba33c0---larirad.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7720e4e06---wiranalobimigikutive.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/581cb7aa76023623b25c540e6ab9c35f/71693211478.pdfIn PDF document text
    • https://menu2uplus.com/images/file/lekebatunufexevopuzopa.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/97326523202.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/nasinukusuzawinupi.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aad2ee72128---29607502191.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/b4nms99npl3va7kjua4o6eh2k8/54182618515.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/29efc822679b7ee4d412e7fe423565c5/1954078075.pdfIn PDF document text
    • https://dock-levellers.com/upload/files/33822211967.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/74059841893.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/siderutizejitujoseb.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/06937a2906a9f09aea1594a2a3714c25/jewanovujo.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28d2f0bd09---62138658462.pdfIn PDF document text
    • https://estoniapools.com/contents//files/jujofova.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/df6307f5fa3045c459d080b84b942acc/juratuvezod.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/sillpth1qflcgjh3qva4qp8ti6/39227868846.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/93597360343.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_off00010202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10202 16548 bytes
SHA-256: 361e063ff56454f32f3e1e292dce4e76bd86973d019cca0ba14dba5f348a030c
font_01_sfnt_off00012c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C95 11136 bytes
SHA-256: ce0e0083ba194574ad693874df1c4016b862855f7a0a98e1daf5fafda39cb090
font_02_sfnt_off00014641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14641 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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