Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77b2a20897b004f…

MALICIOUS

PDF

89.9 KB Created: 2021-07-18 10:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0c61042941fe2d53393a65c46f8bea0d SHA-1: 668301da73063dcb9a2d334cc9cdc0cd336b9e80 SHA-256: e77b2a20897b004f1c84bddc20f5c1dc65423640a9f840116d2c34e3fb7548cb
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and does not provide clear textual content, but the presence of multiple links to potentially compromised hosting suggests an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4966566e8---tuvasosebodagefomi.pdf In PDF document text
    • https://balaji-technology.com/userfiles/file/vuvogexepag.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609deffdbd63f---wujivanam.pdfIn PDF document text
    • http://gabortech.com/admin/file/58787672184.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/974c389f77ce719fa74fd0dc5c3b5c13/tapivafitilavesipavidu.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/gesudepuvilidi.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/410b5d1af7f2254c0c4d36e142e96d65/18716711821.pdfIn PDF document text
    • https://baongochoa.com/upload/file/96666613472.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/91308141854.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f07e8fdfa22---81480515013.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/81483190529.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/relutugorotosulira.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/36154868103.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609406639906c---92933166031.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210507081044386.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/36171619872.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/5h9u7de3j9jvrvkoo4s77genl3/fezezolapovifovuz.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/safajotenug.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/tipapezixoxeserajidik.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/002200da5a16a60b2230262bacd17b1d/zezavaxudaxibiwowasur.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/60153073583.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807c860aa06---sasiwozifak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=bio+data+format+pdf+for+marriagePDF 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_off0000fbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC0 17828 bytes
SHA-256: c8adbd28e099417dedd50feff8c007fbc8804d5030d85e79737d56164ea2a1b5
font_01_sfnt_off00012a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A79 10576 bytes
SHA-256: 4faac7b656a6c57b0740329be472e508834f05572f61e4a18ab5fd1cd15c211b
font_02_sfnt_off0001426d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1426D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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