Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c952c72ff0fcbf…

MALICIOUS

PDF

84.6 KB Created: 2021-06-26 06:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75675a19af515c159caded9a692ac86c SHA-1: 0db27b090978f65ea3aa4aefb1e555f4034bc4f5 SHA-256: 39c952c72ff0fcbf3ebfee5bedf97c638f56154a1e976ed3167b4064dab5cdb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised WordPress upload locations and disposable hosting sites, likely to distribute further malware or conduct phishing. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit web vulnerabilities or trick users into visiting malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/15951316429.pdf
    • http://littlepearlspublishing.in/data/eimages/file/34070703391.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bce27e03e---29970885722.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb864c0878---buremusal.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2213af467---87777376600.pdf
    • https://nhatngudongkinh.com/upload/ckupload/files/xidurikuxazifujifejupu.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/51733c0ac5f6c521e468770fb9babfc8/vebebijunanalifolutafe.pdf
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/710dc7024a531460af12375ef63bff54/5215832966.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ce2cbe650---57291276300.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608826a1108f0---jenefumovaradezufulosa.pdf
    • https://aimhc.com/userfiles/file/vesojuvujam.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bbad62165---58425510176.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607098b35ab8d---tatawixebubepuvut.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f74a5489---jopanuj.pdf
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/gamawos.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160740538eb3c0---26741841213.pdf
    • https://rubin2000-distribuitorshop.ro/userfiles/file/bijeguwisoragowiduv.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c951bbac327---52180202278.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e83f899f9---zekamesuxut.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160babac615753---49426499622.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/9f3acf0c23e922670dd739f75cfbb430/sisazuvodawuvubevisulinap.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/rb9cgir3smtgm8k261neh86c3q/mexusexalezovibiwol.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=marvel+legends+moon+knight+review
    • 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_off0000e772.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE772 16792 bytes
font_01_sfnt_off0000ff84.bin
91f9ed119b9207c8ca0cf8af5e3415448c42b2b47b783465112ad02dfc004ffb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF84 17152 bytes
font_02_sfnt_off00012c5c.bin
bbe955524ec3e5030b17d25cd8afac0d38444d5f0007766674e6484968b74f2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5C 10932 bytes

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