Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ffc77e8cf154cc6…

MALICIOUS

PDF

97.7 KB Created: 2021-09-07 07:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3734a0aca4a8a1293342fc3c8889d30a SHA-1: bcb73b607e5a239c743335683813b903b2417489 SHA-256: 7ffc77e8cf154cc62027d5681168940770ede57243d7b371d68af4551d7760ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://chcial.ru/uplcv?utm_term=classroom+of+the+elite+volume+4.5+pdf PDF link annotation
    • http://barrospizzadb.com/uploads/files/zunexupobeveba.pdfIn PDF document text
    • https://poker-fire.de/file/pisunusuwipomozilesuniwe.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/6cd8503b3f7680569b936718a0784e93/98816654937.pdfIn PDF document text
    • http://surtek.biz/image/files/20150116_151056.pdfIn PDF document text
    • https://manorhair.com/uploads//files/202108030846183536.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/21562323483.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/52153b3b8afe08438f9ccf7bc42e63d2/jizizipuboxed.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/jagawokalikatinejilij.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/a8dc23b94f9aa4196d7aa93b5c42a358/kuwuzofajajub.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/u4t0du76kkecst0jt8judlpnsj/gebepuvonowit.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/97351576748.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/80749561347.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/tijavedofitobojojadiwi.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/sagewagozamubo.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/3751ef913f6472bc355eefd8786796dc/20003254297.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/47794259258.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613600ceee4e4---bejenobu.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a250fb945c7---93390223068.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608170bb29b7b---giwovemoj.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dc8e50494---marokijusa.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/lozuvibufesufilig.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/65h9bfkkjrcsd3u72b5ksfj6p1/95904440429.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096a09bbab63---47390407722.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/5518301105.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_off00010a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12245 11132 bytes
SHA-256: 79d4f4ce5dca5b7d3d7adb3f50b62211cceae769930ca88575158d9b2f5c0bf1
font_02_sfnt_off00013c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5B 23568 bytes
SHA-256: e3726d2796dadb2780cdd7c82eccbd9b881f035f5d66ab17299504ce7917ed93

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