Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcbd30130961098…

MALICIOUS

PDF

80.5 KB Created: 2021-08-23 13:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5175e3a13124431b2be442196366ed97 SHA-1: 396aee12022874d152979678a6e27ff9ffcd073f SHA-256: efcbd30130961098b686a45fd51b1d223caa019ba77c16e31b64638de614f4dc
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, suggesting it's designed to redirect users to malicious content or download further payloads. The presence of LOLBin tokens and external URI heuristics further supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/392902dfca7884143755f5d42622bc71/fiwapej.pdf In PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/korifejoxa.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/16822921809.pdfIn PDF document text
    • http://fygl.net/uploads/file/021909506512.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/aj1nadd15vcrubvtujs1q3d2l0/78678082627.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/23i3k8jrncmd26uqrs1lcfanjn/jumip.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/dubajunatanomulejodipu.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/virawegusido.pdfIn macro / runtime command snippet
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/5ce4b420f61a9275db13d55c31d514a6/66321507472.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/27177831879.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/6a0ffe1926b10cc96fd9b3be1b5b4e39/gulopafozotitow.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/86230341841.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/3cb1b39e4475d05aa93cef8c41f3a69c/vivekiru.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/tilukosisap.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/01f3d56c5936a00adcf05a730452a56d/86262427797.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/17647033096.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06f282c486---23832320311.pdfIn PDF document text
    • http://hoggard1975.com/clients/a/a4/a43fc1111b7ad4318f8b553feb79a890/File/86631273063.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4dad3e6da---gidera.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/podopa.pdfIn PDF document text
    • http://texmet.pl/userimages/file/zikokovojel.pdfIn PDF document text
    • http://dsfly.com/uploads/files/53389558229.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/momasamirakadukizeg.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/46989606721.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/uskhs4attgfhfk0elkm6v4ou6d/dijixujenam.pdfIn PDF document text
    • http://aircond.md/upload_fck/filIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=clavicle+and+first+ribPDF 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_off0000d9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20E 15796 bytes
SHA-256: 3a8d9c4e387af03a4a0a1b4ddd810f43997b737e8410d8962f49d6dca2d305be
font_02_sfnt_off00011add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADD 10588 bytes
SHA-256: d4a22429d77bf64b86feffc97841725ce412c4f3e6645333ec8504ddffe2a886

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