Malicious PDF — malware analysis report

Static analysis result for SHA-256 f405af9307147690…

MALICIOUS

PDF

74.7 KB Created: 2021-09-01 10:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 794b1648608bba927fc544b3376a0b65 SHA-1: 7de555aa766cfafb24f1cbc9f1283c0bc569831c SHA-256: f405af9307147690fc0e5e0f7b3dc4b33607cb988c8c41843b4f0031c6a4d715
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a distribution mechanism for phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c8e30308ea65a6dd25f4ef86cbf70a62/54678747437.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/15199b37b6a8e35237d7fee5309d2ae6/dapulak.pdf
    • http://okeefesreef.com/ckfinder/userfiles/files/nixafetibid.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/d277cee74627343be17802dee5497577/14943371641.pdf
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/murulawaledupadufeve.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bebd037de44---31304478246.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8afd06723---28350749309.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/8dc83745289c32edcc4214e62f1312f1/fuliloxojawud.pdf
    • http://ms-beauty.com/ckfinder/userfiles/files/1411556459.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/10ccbac9c309d22c4e4be101c15c78c7/legurowoxe.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/c4dd7e192b9f8abd46c4b679e960beec/jutolomefokapekigijatuv.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/91528489748.pdf
    • http://architettoannalisatinelli.it/userfiles/files/77304558962.pdf
    • http://geodeslaboratori.eu/userfiles/files/fuwili.pdf
    • https://bloomeng.com/uploads/tugolepakokokopejevagit.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/eedf3da65129780a3b3b705641fe8c0d/nuvojajaxezi.pdf
    • https://dwitunggaljaya.com/sitefiles/file/fomedinataxuz.pdf
    • https://investmentskillsgroup.com/images/userfiles/file/71164455476.pdf
    • http://jessie.vn/images/ckeditor/files/687716892.pdf
    • http://karimeh.com/public/userfiles/file/66075357515.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e628767bd19---11044746918.pdf
    • http://sva-jeanroze.com/xmedia/file/kufufasolamidejuk.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=types+of+pink+eye+infections
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B5 16792 bytes
font_01_sfnt_off0000dbc7.bin
bfaad30f212be10ce96a2edc7b25fd84ad4a352f3d89267f333ef0c7b9501bb4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC7 15980 bytes
font_02_sfnt_off00010504.bin
df7e54c96fbd6847e8535028810ca924c3c1bf12c25c4fa6fa1491e8e2687759
pdf-font-stream PDF embedded font (sfnt) at offset 0x10504 10336 bytes