Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4eeb7e2da8891a…

MALICIOUS

PDF

85.6 KB Created: 2021-08-18 20:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e28b257a927731111c930e898665e429 SHA-1: d8eebcf3aa27fa1552f7c7b18d975bf3f8496d9c SHA-256: ac4eeb7e2da8891a4859da345489f8eac3662a2fd7438b7deca9115b98c0b7f3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised or disposable domains, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this file as malicious, indicating a high likelihood of malicious intent. The primary function appears to be redirecting users to potentially harmful content through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/46057262601.pdf In PDF document text
    • http://canoto.us/Images_upload/files/61319493093.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/gaxukixobakugabaz.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610488d962857---filarurafudofoxilovife.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/lekatodita.pdfIn PDF document text
    • http://policylic.com/uploads/files/23787201035.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/dojuzomuvow.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/vuzenikigipesugajogupebap.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/48620d5959da9c808d6cb7b6282b54ec/begovakimulesuxeruletima.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/34923291689.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/dumolugena.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608372808c03b---57272161843.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55bc539a20---63646809687.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/17163584489.pdfIn PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/85983959330.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/gelubezeruxanogoluge.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/opuiuu4hp0t3bi5k5oj0aa844t/93729184234.pdfIn PDF document text
    • http://ge-mak.com/files/52272948204.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/tamagevevelazafexur.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/tijok.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/4769877700.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/nijipamedekofimisesenaxo.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c5c49ae2b---lumemub.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/85146491931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=cv+form+sample+myanmar+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81F 10680 bytes
SHA-256: 84fbb4a52095cf261d9a12d6138f2dd2fdd1c24f038d24f2862d371f55c935f7
font_01_sfnt_off0000f0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A9 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_02_sfnt_off00010625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10625 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E37 16280 bytes
SHA-256: 098ae202f978d17781c2f36b7342ba124a67ba8604421583b3f9273a3a1179f6

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