Malicious PDF — malware analysis report

Static analysis result for SHA-256 03582e0342636f39…

MALICIOUS

PDF

105.6 KB Created: 2021-09-16 08:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e8281b1b3f6155fe0cc21d25cf2c55c5 SHA-1: f161557e3f07625115a13a2b97a3e6bf77136aec SHA-256: 03582e0342636f39f0ba3f938656687e37e2d3c310537d3b4df9debf8f737948
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and does not provide direct textual clues, but the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://patoman.ro/ckfinder/userfiles/files/97443238154.pdf In PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/dd7d4961ad415c81a3fc6fc20eabba12/pogokofobozijetivojira.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/pewifovomidab.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/kelivorametax.pdfIn PDF document text
    • http://tabletopad.com/images/file/jumuzesokunifivimira.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/48928464476.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/89496261984.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140beb157c86---82589927939.pdfIn PDF document text
    • https://losungversorger.com/product/file/kevejasedipiluwobaxe.pdfIn PDF document text
    • http://klientskazona.radeton.sk/ckfinder/userfiles/files/tekite.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/xokagukitasow.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/30151807003.pdfIn PDF document text
    • http://popmetre.com/news/files/loxeperirafox.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/8694787004.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/newonadotedirivujataguful.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0b438472b---xopawogadidelimetomej.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/9998555818.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/77355573155.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/11409181673.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614258459cf2e---luwawokupavisaferez.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/6dffecd038e8545db6a89a7a6e237a2a/25758690831.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614280662a4be---tadipoxuvavugadipiwes.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/22783154779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=android+11+nordPDF 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_off00013baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAA 9668 bytes
SHA-256: 56ea9b2ea8f7ecc7a782a9f085ec5bbb584eb7bafa0adbf5dc80433e44f31ae4
font_01_sfnt_off000150b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000168c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168C9 18516 bytes
SHA-256: 1f442a9871925a0c18e7fbf694decbfc29f49b244b4ac76751f6103f0a965c0f

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