Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea98785f5cdf0fa7…

MALICIOUS

PDF

97.0 KB Created: 2021-08-01 18:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a7c23d01c6af88245e42effb398bf9a3 SHA-1: 2737adf1ba22f53370016dfea32cd30abbaf47ed SHA-256: ea98785f5cdf0fa70afd8e902a4ebdea94d0a5ba799e7d4b65472c610f66a12c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and link farms hosted on potentially disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure itself appears to be a link farm, designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ttkvaat0hlhgfhmkir7h53vnr2/tuvisefamukanokek.pdf In PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/sokedidojumamipatunebeba.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/tujikopojuvikumikatel.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d0fea25bdc82ccff72f7ad57a645729b/57293870989.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/so6q0c8j02uhn3k71reiclmhc4/fabogevanetugeposarunob.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/nifulovulibawiga.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/29142556350.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/8650184309.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/977ab6d4a7e302c30388b1ab5ffbd4aa/63021303674.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1623495933113039885.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/69465175896.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/ruxujo.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/pusawebadimajadozi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608428dd23e56---diraxovivufovisave.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/85247509711.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/29327225712.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/69e04a3fa5d4e22b6481cfa2070b3f60/lexajedokebekesixex.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/1182858186.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8689b3a441---madunebolerexex.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/nijamesizexibulopi.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a788cdec6c9---keget.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/nalizugevibuwudof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=the+minto+pyramid+principle+summaryPDF 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_off000113d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D2 17760 bytes
SHA-256: 556a56f2779ea1d2fc3cc85c4b97cc1c06073272f12a98230d7734e64e84ff9d
font_01_sfnt_off00014288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14288 10956 bytes
SHA-256: 15be17017d839efbb0a487562a68430f17f52b2530f1b1055aa8e642e7aec8e9
font_02_sfnt_off00015bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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