Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8a1bd5aeb437ae…

MALICIOUS

PDF

86.1 KB Created: 2021-06-28 13:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1f210ce025fae016dabf699d8ee962fc SHA-1: 23f4a69a9abbc6051c7a3e3067ad6414a8e69970 SHA-256: 1b8a1bd5aeb437aef4e6cfbdf1364810b59f9f9947a060b92eefaeffb1400b33
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous external URIs and links pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests the document's primary purpose is to facilitate phishing or distribute further malware by directing users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://philabc.ru/uplcv?utm_term=formulaic+in+a+sentence PDF link annotation
    • http://travelshops.pl/userfiles/file/lulugupolulixen.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/68919117894.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160736ec17fc7f---gudilabamirol.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608657911fddf---bozepati.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/famizexekutufunefobij.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/26efeb3b65fbaa9c81d138a65900ae47/kerupuxi.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/nogupigizixutimizisebo.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/bitir.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/7gt3qk3m957rof99if453jaoa7/leleruzorurewanekok.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/905ea8b17356bfe07518ad9a927465ba/fetikojozilub.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec086a6405---62450950150.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/64e0a3cdd086ff844503a7599124468d/nukuwemilijinuvoxoze.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/bfbb671441b4b6629cc4bde50b981453/mutakosokitupisogawul.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/gagizafegufo.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/28ee7decbad03743141eda4312716dac/65989660117.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ic5qgnemth74nn9vej6l5p6c84/5934149042.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071beade60f3---jibedadejaridisepu.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/17727514050.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/31541342634.pdfIn PDF document text
    • https://mfdesign.hu/files/file/gebowewamivulutozov.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/75008753477.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd906ea7e0---84586576307.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/nogexalo.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/fufizuxobi.pdfIn PDF document text
    • 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_off0000ed23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED23 10468 bytes
SHA-256: c416e3d07b2e66bfafec1c53d4b7e42752f342d60fbccc36cc8e4be708f00eb5
font_01_sfnt_off000104e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E3 17108 bytes
SHA-256: f24d2c99c0a4accfe06e1c8c73747558c7d797026b4d59b50910578d895ed05c
font_02_sfnt_off0001319e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.