Malicious PDF — malware analysis report

Static analysis result for SHA-256 637905e88c9fc907…

MALICIOUS

PDF

98.3 KB Created: 2021-09-01 06:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be0c88e97fc55f5cfc1f7188a13ea46c SHA-1: ab29a8454d150c130260072b465f4554f6680de2 SHA-256: 637905e88c9fc907eb6b64026d204567d90e53340c0f7f285d57f4d645e913c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being a link farm, with many URLs hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/8e8f12adf686803b8395f5ad7a4d1a59/konaroritebem.pdf In PDF document text
    • http://rialta.ie/userfiles/files/11814427388.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/5a7cc34a18c3fbb92fa74417f3c5c5e5/38383909546.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/l35opnmueatdepgp99itb870690snjac/vodofidujorisu.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/walekaxilisedewi.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/fepofogonivapopopu.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/27976222499.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/97ec55bf0a57c3a497327b0fe2245ab0/javamexalumovisewit.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1611c498a09e2d---94135102993.pdfIn PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/napuwalimasuj.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/e4e85a1a32c477e9b66e888c3275b29e/68157084377.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/dajodikulemibuped.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/d197c783bd457b90fb98f12b4c0ab5c4/denegadafujo.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/smmoaanbrk9cm3iamltctfb980/rowegafabajegebute.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/lefepujaguxabulew.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/dt7horo008vtr8p2pq1uckgvn3/dumejen.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf437986993---lopujulituvupevavivuratum.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/49267951562.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a663087c5---gutudipusorisirafibux.pdfIn PDF document text
    • http://twtime.com/uploads//files/202108061129478525.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/senirapetoduvokut.pdfIn PDF document text
    • http://ping-property.com/user_img/files/13534845696.pdfIn PDF document text
    • https://www.utn.ac.cr//sites/default/files/files/soxituruka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+invite+friends+to+a+realmPDF 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_off00011b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13329 10656 bytes
SHA-256: 849f9a355fc3f423ef6830dace5040b645eebe5064bfb4db1eae6e8d6fb92c36
font_02_sfnt_off00014b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B91 18492 bytes
SHA-256: c0898370b2d7a7fea34191709b2abd35ba24ba7b3086581b934c2be358a3dbb4

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