Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2d4a0aaf1b8a3cb…

MALICIOUS

PDF

72.9 KB Created: 2021-09-28 01:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d6760253eeff6ba1d935fcf22febcd35 SHA-1: dacc10239094cc969974a9a056e79a0962271dd6 SHA-256: e2d4a0aaf1b8a3cb4c179ea339c696635b04ce3ce9c80d3c97108949fd4484fa
156 Risk Score

Malware Insights

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

The file was flagged by multiple heuristics as a malicious PDF, including a high-confidence ML classifier and ClamAV detection. It contains a link farm with numerous URLs pointing to potentially compromised domains, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF link farm heuristics indicates a deliberate effort to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://777mto.com/contents/files/80405564997.pdf In PDF document text
    • http://cdkuys.handysociality.com/upload/files/jototimokekusolegiwalev.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/pirodemezoxetesow.pdfIn PDF document text
    • http://irths.com/upload_files/files/degajosefud.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/dotudujelakuk.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/jazubiz.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/wawuvobekanadafadopo.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/sunukogidob.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/5320408322.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/9063996675.pdfIn PDF document text
    • https://laser123.com/geektic/files/72566777522.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/6600852239.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/pumewedukalobifu.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/79477803951.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/foguruz.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/satijugorumumijo.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/07f44a99e6bdfe7cbf11e4b815b0ba0e/sodeliwaduje.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/gosoneterul.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/bunimuwibifax.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/68206542610.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3504a286b---28473689286.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/73153169164.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614eea5486e68---bexevanedejapuneto.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/53598757221.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/59951209362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+set+animated+wallpaper+on+iphonePDF 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_off0000b7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B4 17572 bytes
SHA-256: e74074b7bb52bac6c98d99e00c00e5ba2d9900ecbd2f4f83d87c6f02ab0c2b1a
font_01_sfnt_off0000e4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EE 10732 bytes
SHA-256: a17e0254118ab2de2bd25d471f7d8ed57cad497e531ac7d52186f0e44a18194e
font_02_sfnt_off0000fd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1