Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d56faeab40ed0f4…

MALICIOUS

PDF

83.5 KB Created: 2021-06-29 04:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 27fd34824e23c911140edc00d226deb8 SHA-1: c7fdbf4709bba5805d029c723eba4f60cf4255a3 SHA-256: 7d56faeab40ed0f4618a7027d1e9da621cfea672356c1ccdc916716941f9c509
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of multiple external links strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://sghscsjamarai.org/guruhargobind/userfiles/file/95904748594.pdf In PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/da9e9673a0e33d21790980ea4821ab7a/20821669789.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a09e7e06f---52618873020.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5ba1f0a8a---5696476720.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/c99176c36596418108cf2067b2978351/xewazixez.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/rubobowopemop.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/abe03269d5ac218329086f3e27a4cdf9/3370670002.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec4bf4db00---67333383148.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/idpd9fmj9snk3cnpae9a3dg947/dewofajonuzimobujirug.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/gigixedulesefik.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/32891921612.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a02c564b5aa---lorojalowogi.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afa54ad0d67---86128516032.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/ad71561229b6c366176932572162c64f/14576490264.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/118c9b73ab70159287c14acba55d8794/kisedepomuzotajenun.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe92ad1e90---15459040732.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/diriganemejagegadekogi.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4ed74e444---46662508589.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/5fa59cc36c9d46a15c77125a81148ebb/72091091084.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810baba2c33---feroja.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a633b0b9618---55816022557.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad246f3d6e---jirikelejafi.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/vewugukesimufod.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/a5ee1966dca319b04f3b24114ec4b50a/89207379343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=jang+wooyoung+and+park+se+youngPDF 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_off0000e1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C2 18260 bytes
SHA-256: 887ba92f0e5b91762c9781771014665931a6e84ea5b51e0a7a76b7db809a879d
font_01_sfnt_off00011020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11020 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12837 10716 bytes
SHA-256: b01bb6bb59aca49d3ea812bb7e6ca38803275a4c71052df5c7fc82ab508cb22d

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