Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe6cfd27e956be0b…

MALICIOUS

PDF

90.2 KB Created: 2021-07-04 10:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f1bc73e80e91c80c5f0af6c6fa6bc139 SHA-1: 805bdb3a2e63044a71733475abcd76924979c07e SHA-256: fe6cfd27e956be0bff0b641ddb67d81a9571fa565964db62a65b745f783863c1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to redirect users to malicious content. Heuristics indicate it functions as a link farm on disposable hosting, and ClamAV detection confirms its malicious nature. The primary attack pattern involves luring users through a potentially weaponized document to external, compromised sites.

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e1f82f8f9---balafisulebakumafotatugu.pdf In PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/ac76a7684dd9759da3596e05fe58d6a5/47271965382.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/667d7cc2c44b86a72f2f95f8e3d2b1ac/32775828780.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f09a6d3a16---25841266425.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/notidijarubobaw.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/c630lgck4lehu424om6hf48eql/posoje.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/pivewesodaweki.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8d37ec1dd---83719662640.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098cd51c46f5---girafowelanesisoga.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/xifis.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/50936811707.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/oluss9vc525mf36n2fs2smgrb6/palepejob.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/80412052452.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a9ef30d5e---demol.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/bikizamatubodazig.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5822c1cb69b2b0290eb37193ae9d5eef/16163781713.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/99863917992.pdfIn PDF document text
    • http://corporacionnoa.com/UserFiles/file/ravolaxetuzenatusate.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/56738892263.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbfaa6e8f6---dikazenomugigovugisog.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/uciumn5j0iduh24cb3baa7nvqv/91027989041.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/nudarunurulatamitelutu.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57ef6b2bc2---lunosivemesuda.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/cdcdd89897936c4acd3eaac873b4691a/50440201516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=hypoglycemia+is+more+dangerous+than+hyperglycemiaPDF 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_off0000fcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDD 11168 bytes
SHA-256: fc53e2ffd0f8236f0a8dbbd49aa883edb1513265b5d85ecf1ba243cd7c487cd4
font_01_sfnt_off0001168d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9F 17000 bytes
SHA-256: 61b3f0d7d8ba62bd5cdd5c0c89b97e01309d002f4379ba522db563caca155020