Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0a90f825617fc17…

MALICIOUS

PDF

84.4 KB Created: 2021-08-18 11:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: beecafc779080d49fb5a203fb733e71c SHA-1: 16d427a1dd282c0f2afa3edc2ee99f2fcd9e7478 SHA-256: e0a90f825617fc17206dbf5ab50a0b83797c88cd3036b11b37e4bebe4cfa4fa7
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://viettrungson.com/media//Files/nazobesolumizeferikam.pdf In PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/lefilorimadejekizelabozis.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/75057555049.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4591d0ebe---zomuputugafemozivisujox.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160feab5b19eab---4825346779.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/84058153519.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/xevusavelivu.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608267758f1dc---fowigid.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/womamutakufomosuke.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/xuvov.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/tobumim.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd26cdbe5---nesezujidudipi.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/nukirosixejerataji.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/gojobevinoresij.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/6710595719.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/d04a073b69932ba29a01588980623a6b/zosekifirumemabufekota.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a57fd2a2fa---rinikuv.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868e524f8ae---pemufilogodomujudesirojiv.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7a8d34b15751a344e3af51d1dc820dd2/samesawizememo.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/dijoxijomodozujisa.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081954559789---vurazixotofup.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/2efbkhols1qkoc3klk0cv837fo/17135925498.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/xilalapesomatisepufude.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/a9b8d8e234564a8d74babd333673b01f/44067734265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=adina+thembi+song+downloadPDF 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_off0000e805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE805 16572 bytes
SHA-256: 0c09507056891ad5990aa28ae424b581e63a79076114953e362c1563cdfe06ce
font_01_sfnt_off00011355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6C 10800 bytes
SHA-256: 0365dc5a043ec06db1ea4e7f2bb29055bd7681f08f5403d67765522b149b1062

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