Malicious PDF — malware analysis report

Static analysis result for SHA-256 f785b952b4d85c69…

MALICIOUS

PDF

80.6 KB Created: 2021-08-30 10:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e677a49e880bc7505a8ffaf0650ff295 SHA-1: 30ab9255a8f4a02d15a868c07c25c6abeb7672a1 SHA-256: f785b952b4d85c69e0d3faf70e6a496dad28b7e1bdda9411179f1c60d3eaaa0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. ClamAV and ML classifiers strongly indicate maliciousness, classifying it as a phishing trojan. The primary attack pattern involves luring users to these external links, likely to download further malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/f9c11df45323605e5b3c6c0e3c5e5d4f/migefuvapujiriwo.pdf In PDF document text
    • http://smartvoicecom.com/userfiles/pizorekoxisoji.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/zuxugosigafepilaluwo.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977ff4ed4a1---sotoretelotolakenil.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/zexasezalo.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/4b855f496789cf1f8e7f9cb167921e61/ganoreligagevoxij.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/2b784d00be68fafe2f4bfc9c8447289a/nusixibemo.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a9446417f---31210597340.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/lenafax.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f97464c136---zufifazazadisetekafogo.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/roniwiwo.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/4jlec5t0htvmtstf57fhsn13tg/11688383659.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16095fb3936468---20143186419.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/8ijcde42j5r95euj2vv8n0vlc7/50374483666.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/d0f6470af5fe59a1e8ac244b879825f2/menotujavivobififem.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/begeletebajuvugudawedun.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/kagivipedifivelupajopotox.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/18ab5493d6b5ed3e289d0576de089b12/xifobetunisekamikapita.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/340559809.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/52716250511.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/27507681716.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/ad281e97da500c6d2c580d0ad53347f2/wedogobupun.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/85615525050.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/d2aff2af316a4757fcc8f1bc59692678/78375240157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+glee+project+123moviesPDF 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_off0000d6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F1 11060 bytes
SHA-256: 14a55b6fadb8c1fca0ed888cfaa6576944c7393a7bee6de11197cdb8f943b0bb
font_01_sfnt_off0000f0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D1 16548 bytes
SHA-256: b5beafd41709845af62d45a863b0d2dab42b451e32c9d06852ca7eb2a3f8dc30
font_02_sfnt_off00011b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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