Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8dba1e6a435f78…

MALICIOUS

PDF

82.3 KB Created: 2021-07-06 05:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: a3881aea467acfe615e90b81390c6aa2 SHA-1: e1d21f13f97315aac971faf6c7b15d1af39b4cde SHA-256: 3a8dba1e6a435f78de795bba19c191cd39e8f0f71c9199994ec7c134ecca4d66
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external resources, many hosted on compromised websites, suggesting it functions as a downloader or part of a phishing campaign. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/gle123a724mj4in8bctrh0prtg/37682716123.pdf In PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/de0f76d7324b741c6068e1c0f93e5f0a/72809577860.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a33e8718a---judebabazeneminuvor.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/388ca7cc716564590aa7f879e6ea7e8e/didepebuw.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608e9944ce70f---madefozotikajimepu.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/vebetexadisexax.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/kp7dov2gts0bhkkqabn2ke9tb1/47980460149.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/mafipuvafiwikakikawo.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/31214148965.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/e16aekht25qt7dg5370imb4fe6/18162012070.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/dozimovelupalubelesisaw.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/92368219777.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/6149859766.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/86874010401.pdfIn PDF document text
    • http://tai-group.com/upload/files/fizudukat.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ca8ba6cc7---wirurejusibutexuzilipew.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607016471682c---sajofewunevadetajopim.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608aac6de468c---44497593483.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb71c27fa88---zetitezazoxudimufare.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/3787854396.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3d172f2e3---zapuxuwapiposulakenib.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/limofawuzadulivek.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d5b7af548---ruruwasijazupuku.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/dikifezakawedezamuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=gate+old+question+papers+with+answersPDF 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_off0000df2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF746 10860 bytes
SHA-256: 759275c73d4114233c0b9b56ba9e0a96699feb47bb4b06abebe600966b852987
font_02_sfnt_off00011020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11020 16912 bytes
SHA-256: 3467b0c1209357696d16eb178def66fc693cb2d40ab91778ee6fa91b27f7ac76

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