Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd46d3edb8133f9…

MALICIOUS

PDF

77.5 KB Created: 2021-07-09 17:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2f7eeaa91dd88b2dba5e0c90e3eab1c6 SHA-1: 5bb182d9d05de2e00c3a12e83569349d9583a7b5 SHA-256: 1cd46d3edb8133f94552b218c8097867e7602b173a04faf39e6cdafccd16b36c
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous links to compromised websites, including WordPress upload storage, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links indicate it's likely used as a lure in a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://bmsorganica.com/userfiles/file/punewutu.pdf In PDF document text
    • http://www.irrv.org/uploads/files/livijusasanazisilot.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608169b0f10bf---43843948549.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad97c533877---80092240069.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/nulovapigevupi.pdfIn PDF document text
    • http://matras-devison.com/upload/file/kamulurari.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/44886407085.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/vepovasikadudiw.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/2200860180.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/55380986231.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/8fc595fccec5e07f96cfcbcd6a94659d/36000847932.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5976fead62---90885931688.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/3bbe4f4cf541c78d5b0ba7eff4db35d7/nikewanusipanuwitumok.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210509104305.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/69505006842.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/puwaxusogukavinoxiva.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/krj29oeuu5d2bnbih68gtseb9g/padevexoxi.pdfIn PDF document text
    • https://schmitz.cz/res/file/kakivasawiresefidem.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b436f14a20---93709455837.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/d56987e49c339dea196dfc6947f7d0fb/kezivorulilame.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/botikogigolojolajegezom.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/clmgdmvpc4h8ph776irh4i0dt1/vanivikebokona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=operational+terms+and+graphics+pptPDF 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_off0000cd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD66 10988 bytes
SHA-256: dd8abc43afc3477ac541fbf01a4322b38e60f1924ca683fa910cd2b332108de0
font_01_sfnt_off0000e680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE92 16428 bytes
SHA-256: fe40db1f2813428d94ad880a7c681fa30602df9c752ce77b6cbc8f655052c440

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